I've been trying to trade a key for some refined on scrap.tf recently, and got the Steam Mobile app so I can authenticate the trades. Problem is, after a week of waiting I try to do a trade on scrap.tf and it tells me to authenticate the trade on the Steam Mobile app, so I get on my phone and open Steam mobile to confirm the trade, I hit the buttons, and then it tells me I need to confirm the trade on the app I'm using at that exact moment.

No idea what to do here. Should I remove the mobile authenticator since I've had it for a week and trades should be fine now? Is this a known bug?