I am using Nintex form on SharePoint online where the list has lots of numeric fields and the fields have display as percentage. On Nintex form, there is the number input with decimal.
If you enter 5 (meant for 5%), the form saves back to SharePoint as 500%.
Not sure if Nintex form has a setting to know it’s a percentage field?
Workaround I am using now is to create a hidden number input on the form, create a rule to divide the number by 100 and save the hidden value to SharePoint.