Webnus

When I try to add an event from the front end. When its submitted it just spins and never finishes.

I figured out the issue is with websites hosted on A2 Hosting. I had just moved those sites from Hostgator.
Any idea what could be wrong? Maybe some PHP extension or option that needs to be enabled on the server?
Adding events on backend as admin works fine it's just the frontend submissions that don't work.
Thanks