I would check for some type of script trigger. Open the script debugger while navigating around your database.
The way the Modification auto enters is they change when the record is modified.
Simply clicking into a field and out won't trigger a change in a modification field.
However, clicking into a field, making a 'change' could be entering a character, then deleting that same character before exiting. The database sees that as a change. Even though you might not.
My hunch is there is a script that fires when you enter a record or layout that updates something.
Post your findings back!
Many thanks for your answer. A script trigger does sound plausible with this system, I'll have a look and see what I can find.
I'll let you know.
Thanks for your help!
If you still have the "old" (v12) copy of the file, open it in FM12 and see if you get the same results. If you don't, then I don't think a script trigger is the problem because as far as I know script triggers work the same in 12 and 13.