RenderTexture and OnMouseEnter offset

I am rendering the camera view onto a rendertexture that's placed above the panel with the characters. I use a simple item pick up system with OnMouseEnter/OnMouseExit. When I try to pick the items up I have to put the cursor below the item for it to register. It's caused by a second camera I have which allows for the items to be picked up. I have no idea how to fit it though.

Here's a video of the bug https://youtu.be/UgjzzfuaKJY