State Mismatch error with Contact Form 7

When trying to set up an API integration between Contact Form 7 and Constant Contact, it would redirect me to a wordpress page that said “State mismatch.” and a link that said Back. Clicking back would weirdly take me to the Private Google Calendar’s settings page. When I disabled Private Google Calendar, I was able to complete the integration, and thankfully, upon reactivation, it doesn’t seem to be in conflict now, but I thought it was strange and it took up a bit of time before I figured out it was this plugin that was causing the issue.