I have a very simple interface, which just shows a list of fields.
Whenever I load the interface fresh, the fields appear to have errors (see below):
When I enter the interface editor, these errors disappear and the fields appear as normal.
When I exit the interface editor, the fields continue to act normally until I close the page and revisit it later (then the errors reappear again).
Inspecting the elements that give errors doesn't seem to reveal anything configured incorrectly.
Does anybody have any idea what's happening here?