Touch screen issue

I just got my 3DS back from a repair shop today. They replaced the top screen and it looks good (I even paid extra to keep it IPS), although it looks a little yellowish now I think. But that’s not even the main issue, the bottom screen is. I can’t even open a game because the touchscreen keeps tapping on its own.Before I took it in, the 3DS worked completely fine. The only problem was that the screens were scratched.Is there anything I can try at home to fix this, or do I just have to wait and take it back? It might take me a while to go back since the shop is far.