Hubspot Unbound seat booking engine is a nightmare to navigate

I've been fighting with the seat-saving engine all morning - endless load screens and error messages, then finding out the seats that DO get saved end up dropping me into standby or falling off my schedule completely. Is anyone else experiencing this?

Also running into the issue of removing a session I can't get into, and unable to get around the "double booking" error even after the time slot has been cleared and the limited capacity session has been literally added to the schedule - so how could I possibly be double booking??

With the runway to the event, the many Inbounds of years past, and the resources that Hubspot flaunts, I'm really surprised how messy this all is.