MS bookings 'something went wrong' error and deleting confirmed bookings

In the past week or so I've had complaints from people attempting to book a service through our bookings page "showing as something went wrong". Despite the error, the booking is added, but I don't get confirmation come through to my outlook so I have no idea. Oddly, it's just random days and times - but it won't work for me either when I try. I've also noticed a change in font and other small tweaks in conformation email I receive. Yesterday, someone rang to complain and I saw they had attempted a booking with the same error, when I looked at the date they attempted to book it had somehow overridden existing bookings from two clients and replaced them. I can see the clients in the customers list but their booking has gone, and i've no idea if they've been sent a cancellation. I can't rebuild the booking page as I have existing bookings through to next year. Has there been an update or tweak that's caused this?