What is the problem of my ipad?

Here is the backstory this iPad was given to me by my uncle, but it was broken. He thought it was just the LCD because he said the iPad fell. So, I took it to Greenhills here in the Philippines; it's famous because many people sell and fix iPhones there.

First, I got the LCD fixed, and at first, it seemed fine and working. However, when I got home and started downloading apps, the issue reappeared. I messaged the fixer and showed him the iPad. He told me to come back, thinking the LCD wasn't compatible. We agreed to pay an additional amount for an original LCD. But when he tried it again, the result was the same.

So, they suspected the problem was the display IC, and we paid more to have that fixed. After they did that, it seemed okay. When we got home, I started editing in Canva, and it started glitching again. We messaged them again, and they asked us to come to their shop. We have been going back and forth just to get it fixed!

We are tired and don't know what to do.

Model Number A2696.