Yes. I am experiencing this same exact issue. Updating to 5.8.2 did not seem to help, but I am still testing.
Thanks a million. I just tested it and it is all back to normal as far as I can tell!
To expand on this… what I just realized is that this happens when fields are in different groups for the same page. The ‘groups’ publish from newest to oldest, taking the fields within them along for the ride. Rather than displaying all those fields by their order no. Which I am realizing now is probably expected behavior. Can you confirm?
I am also seeing this issue… Custom fields are displaying on pages with the newest on top (I believe) rather than from lowest to highest “Order No.” defined on the field. Any advice as to where to look to remedy this?