Cached Templates in Markdown-Cards?

I had error messages from templates in Markdown-Cards after restart in the HA core logfile. I fixed the template, restarted again - the error was still there.

Interestingly, the source code in the error message was the original - not the fixed one. Obviouse, templates in markdown-cards are cached somewhere and do survive restarts.

Has somebody similar experiences? Is there a way to clear this cache?

Thanks for hints!