Mail automatically renames Calendar event titles

Is there a way to stop mail from overwriting my calendar event titles? For example, if I have a concert ticket I have it entered into my calendar specifically prefixed with the word 'concert'. But whenever mail receives any updated information on the event, it renames it automatically without asking (it does tell me the title was changed). I have to go back into Calendar, find the event and rename it again. This can happen several times per event. I don’t mind mail or Siri suggesting the event, but once it is made and in the calendar why would it see fit to rename it for no reason.