Welcome
Although some time has passed, unfortunately, a problem with the encoding did not improve. Moreover, this situation also occurs in the J! 1.5.15 UTF-8.
The problem concerns the form data ... action = profile & task = update. Now a few tips on how it looks on me:
what should appear as follows: ĄąĆćĘꣳ ? ŃńŹźŻż
is what is displayed after loading:


?? ?


So the Polish letters only occurs ?