If she/he is inconsistent, that’s all there is to it. There’s no hidden reason to it it other than “YOU ARE NOT A PRIORITY AND NOTHING OF YOUR DOING CAN EVER MAKE YOU BE”… don’t be the perfect package at the wrong address
Do you hear an African man speak and you mentally think she/he should erase their dialects in other or be politically correct? Jokes on you…The various African dialects in all its diversities are beautiful languages that ought to be embraced in its totality.