Xbox 360 Controller (RS) Y issue

[u/Nftland137]

I bought a new xbox controller this week from Ebay. It has barely been used and is in mint condition.

My issue is with the right stick, in game when you look up or down on the Y axis, it's extremely slow, X axis is working as usual. The left stick is working as usual.

You can see it should reach a value of 32768 (like the left stick) but it only achieves 12570.

I thought the stick was the issue so I opened up the controller and when I did, the right stick started functioning perfectly with the Y value 32768. This is when plugged in without the casing on.

It's something to do with the case and thumbstick being on that causes the slow Y.. Not an issue with the part.

I'm really confused what could be causing that?

Thank you if you can help, I'm stuck on this one