Also Ollama is traditionally very sloppy with the chat templates they use, which does impact model performances.
Not that I don't believe you (I do, and I think I've seen them correct this before too), but you happen to have specific examples when this happened?
More recently deepseek 2 had a space after the assistant turn, causing issues with output quality and language https://www.reddit.com/r/LocalLLaMA/comments/1dko6rp/if_your...
How do you get accurate information on the template structure?