Tenor saxophone wrong transposition

Hi there,

I'm using Musescore 3 to write some music for an ensemble made out one bari sax, two tenors and two altos, and I think I found some kind of bug about the tenor saxophone transposition tool.
I wrote the parts with the Concert Key button on, but when I turn it off to see the transposed parts, the tenor sax are transposed by a major 2nd up, instead of a major 9th as they should be: do I have some particular transposition settings turned on and I don't know about it? Or is it an error of the program itself? Don't really know of to fix this issue.