Deleted calendar items showing up on Google Calendar.

[Hall Smith]

I am in the process of creating my first boards and I have my board syncing with my google calendar via the URL link in Trello. I have tested numerous actions on my board to get it to work how I wanted/needed it to and items show up on my calendar as I want. After "cleaning" up my board's test data I looked at my calendar, there are four items that show up in my google calendar and there is nothing on my board. These are past cards that I created in the testing process and have deleted.

I have deleted all items that I archived and deleted access and added the calendar again several times. The items still show up on google and I don't have the ability to delete them. 

Any suggestions?