No language specified and no code example provided. This kata has been solved a great amount of times, it's very likely your code doesn't work correctly. Please read carefully this before raising an issue: https://docs.codewars.com/training/troubleshooting/

There's no issue. The error message is correct.

'!c(TTHQTTFu'
'((())(())(('
    TT  TT

The T's are duplicates. All others are unique.

Test for: s1="tMsRvWCNYh"  s2="TMSRvWCNyh"
Expected: 'false', instead got: 'true'

What's wrong with this?
The letter M at index has same case in both of the string, hence the result should be false.

Can you please tell me the programming language and the problem with them?