Feature problem, clear cache message when accessing calendar event

Sea Scout Ship 280 in Simon Kenton Council is (and has been) getting this error. We cannot edit events, RSVP, view RSVPs, mark attendance, nothing. (For a week & a half now.)
I did try hard refreshes on phone (even restarting it) and on my laptop on Chrome & Firefox. Please fix this!
I did just download the Scouting App and at least I can RSVP, view RSVPs & mark attendance. I cannot edit events there though.
Thank you.