diff --git a/atroposlib/envs/server_handling/openai_server.py b/atroposlib/envs/server_handling/openai_server.py
index 98f68682..a715054b 100644
--- a/atroposlib/envs/server_handling/openai_server.py
+++ b/atroposlib/envs/server_handling/openai_server.py
@@ -199,14 +199,18 @@ def resolve_openai_configs(
                 f"Error parsing multi-server OpenAI configuration from YAML under '{OPENAI_NAMESPACE}': {e}"
             ) from e
     elif isinstance(default_server_configs, APIServerConfig):
-        logger.info("Using single OpenAI server configuration.")
+        # Check APIServerConfig BEFORE ServerBaseline since APIServerConfig inherits from ServerBaseline
+        logger.info(
+            "Using single OpenAI server configuration based on merged settings (default/YAML/CLI)."
+        )
         try:
             final_openai_config = APIServerConfig(**openai_config_dict)
         except Exception as e:
             raise FailedExecutionException(
-                f"Error creating final OpenAI configuration: {e}"
+                f"Error creating final OpenAI configuration from merged settings: {e}\n"
+                f"Merged Dict: {openai_config_dict}"
             ) from e
-        server_configs = [final_openai_config]
+        server_configs = final_openai_config
     elif isinstance(default_server_configs, ServerBaseline):
         # Pure ServerBaseline (not APIServerConfig) - no CLI overrides possible
         logger.info("Using ServerBaseline configuration.")
@@ -215,22 +219,25 @@ def resolve_openai_configs(
         logger.info("Using default multi-server configuration (length >= 2).")
         server_configs = default_server_configs
     else:
-        logger.info("Using single OpenAI server configuration.")
+        logger.info(
+            "Using single OpenAI server configuration based on merged settings (default/YAML/CLI)."
+        )
         try:
             final_openai_config = APIServerConfig(**openai_config_dict)
         except Exception as e:
             raise FailedExecutionException(
-                f"Error creating final OpenAI configuration: {e}"
+                f"Error creating final OpenAI configuration from merged settings: {e}\n"
+                f"Merged Dict: {openai_config_dict}"
             ) from e
 
         if isinstance(default_server_configs, APIServerConfig):
-            server_configs = [final_openai_config]
+            server_configs = final_openai_config
         elif isinstance(default_server_configs, list):
             server_configs = [final_openai_config]
         else:
             logger.warning(
                 f"Unexpected type for default_server_configs: {type(default_server_configs)}. "
-                "Proceeding with single OpenAI server configuration."
+                f"Proceeding with single OpenAI server configuration based on merged settings."
             )
             server_configs = [final_openai_config]
     return server_configs
diff --git a/atroposlib/envs/server_handling/vllm_server.py b/atroposlib/envs/server_handling/vllm_server.py
index ba272e76..3c35bebb 100644
--- a/atroposlib/envs/server_handling/vllm_server.py
+++ b/atroposlib/envs/server_handling/vllm_server.py
@@ -281,7 +281,7 @@ class VLLMServer(APIServer):
         ), "Prompt or input_ids is required for get_logprobs!"
 
         top_k = int(kwargs.pop("top_k", kwargs.pop("top_logprobs", 1)))
-        top_k = max(0, top_k)
+        top_k = max(1, top_k)
 
         # Use input_ids if provided (from ManagedServer), otherwise tokenize prompt
         from_prompt_text = False
@@ -408,22 +408,25 @@ def resolve_openai_configs(
         logger.info("Using default multi-server configuration (length >= 2).")
         server_configs = default_server_configs
     else:
-        logger.info("Using single OpenAI server configuration.")
+        logger.info(
+            "Using single OpenAI server configuration based on merged settings (default/YAML/CLI)."
+        )
         try:
             final_openai_config = APIServerConfig(**openai_config_dict)
         except Exception as e:
             raise FailedExecutionException(
-                f"Error creating final OpenAI configuration: {e}"
+                f"Error creating final OpenAI configuration from merged settings: {e}\n"
+                f"Merged Dict: {openai_config_dict}"
             ) from e
 
         if isinstance(default_server_configs, APIServerConfig):
-            server_configs = [final_openai_config]
+            server_configs = final_openai_config
         elif isinstance(default_server_configs, list):
             server_configs = [final_openai_config]
         else:
             logger.warning(
                 f"Unexpected type for default_server_configs: {type(default_server_configs)}. "
-                "Proceeding with single OpenAI server configuration."
+                f"Proceeding with single OpenAI server configuration based on merged settings."
             )
             server_configs = [final_openai_config]