Hi @kinggeov
I hope you are doing good today.
I checked on my lab site with simple input, textarea, and number fields and I can change limits without any issues. Do you see any kind of errors in the browser console when you try to edit your field limit?
Also, would you please run a conflict test? Please deactivate all plugins except Forminator and check if the problem is gone. If so, then enable all plugins one by one and find which one is having a conflict. If there is no positive result, switch to a default WordPress theme like 2019 and see if it works.
Before this test, we recommend full site backup.
If the above test will not give positive results, please export your form, upload it to google drive or dropbox, and share a link in your next reply so that we could take a closer look at this. Also mention the field name which has this issue.
Kind Regards,
Kris