Mouse hover at wrong place

I have a button button on the screen which is enabled when some other button is pressed. The newly enabled button appears at the right place. The problem is when I take my mouse over it, there is no hover indication but if I put my mouse at a position above the position of the button, it shows that the mouse is currently over that button. how can I correct this issue.

In this image you’ll see the mouse pointer is not on the button, but the button is highlighted orange.

This is the link to my project:

Can you guys help??