Blank alerts created on calendar

What I did: integrated calendar into Agenda

What happened: Started to receive blank alert notifications from my calendar (up to 15 a day), no subject or message line, just “Alert -”

What I expected: Not certain how or why this is happening?

Things that might be helpful to know (Agenda version, OS and model, etc):

What do the events look like in the calendar app, are you using the system one or a third party one? Could you send a screenshot?