keyboard return key is always 'Done' not next

[Waseemasif05]

I have used this keyboard avoiding scroll view for many projects.It works well but I have a weird issue that every things works correctly just the return key title is 'Done' instead of 'Next' for all the 4 to 5 fields in screen where only the last field should be 'Done'.Remaining should be 'Next' but they function like next while their title is 'Done'.
using iOS 10, iOS 11
Main project is in swift
Very difficult to debug the actual cause of this issue in this library.
Any Help