I tried to debug it in my vsCode with any possible kind of values and I didn't come up with any mistake now

use the input that was used in the failing tests

I mean the test behaviour is messed up. not yours.
and yes, your code is wrong.

to be fair that's messed up behaviour and maybe I'm only being pedantic

use question tag or no tag to ask questions. issue is for reporting things that need to be changed about the kata, and if you suspect something is wrong with the kata but don't know what exactly happened then that still isn't an issue