Hi and thanks for the response,
You mentioned it doesn’t appear to be a plugin issue after reviewing the Testing for conflicts guide, but did you check to see if the issue still occurs with the default theme activated and all other plugins deactivated?
There could be some lingering code altering the month view, but I think that’s unlikely. You may want to try a plugin like WP Sweep if you haven’t already to see if you can clean up any outdated info in your db.
Can you find any pattern of how the events are being “thrown off” when in month view? E.g. can you compare a few days of list view events to month view events and see any similarities across a span of time?
Thanks again for keeping me posted and I look forward to hearing back.