Need someone who knows about HAIR?!!

So yes I’m looking for help from someone who knows about hair dye I suppose. So my hair was brunette. I dyed it permanent dark burgundy red. Fine at first, washed out all the dye, but a day later go to take a shower again and dye is STILL coming out. I make sure all the dye is out before I get out of shower. Hair drys fine and doesn’t rub off on anything when dry so I assume it’s all out.

So now it’s been roughly three weeks since I dyed my hair and dye is STILL coming out in the shower!!! And ONLY the shower! So I know it’s normal for it to fade a bit, but like this?? It’s strange.

Anyone know what I did wrong lol?