Hello and welcome back,
I noticed you said “Yes” to both reverting back to the default theme and deactivating all other plugins besides ours, but can you please confirm this? Typically, this type of behavior is from a missing meaning a link somewhere in your event or event template has no ending tag. This is pure speculation, but it’s my first hunch.
Let me know if the problem still occurs after reviewing the Testing for conflicts and we’ll go from there. Enjoy your upcoming weekend!