can't delete one occurrence of a recurring event in google calendar - it just pops back up

This used to happen occasionally. Then it stopped. After the 18.0.1 version update, it's constant. I have a recurring daily reminder on my calendar. The icon for the app has "Wed" in red over the number 28 in the app store. It's the 2nd option when I search for calendar in the app store. If I open a single occurence from the calendar and hit the "Delete Event" button at the bottom, other options in a list appear. If I select "Delete This Event Only", it removes it from my calendar (as it should). However, it magically reappears in a matter of seconds. This isn't the only issue with the new 18 version update for the calendar. If I move an event that is not set for recurring from one day to another, it seems to take a full minute or so to actually get removed from the current day's view. Again, this didn't happen before the 18 version software update.