For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Also, I'm confused, as in the first post you said "validation for numeric only", then in posts #4 and #7 you seem to be saying it had no validation.
Hmmm. So ....
@theboss - sounds like you situation is resolved? i haven't been able to repliacte this, or come across any other examples of that number overwriting existing data, so I have to assume it was something unique to your setup.