Is it normal to have a pair of slight bumps on the left edge of an iPad Mini screen?
The case linked to in the OP’s question has a built in screen protector.  There is dust or debris trapped between the screen and the protector membrane.

Removing the case and protector then cleaning the screen according to the installation instructions then reinstalling the case should fix the problem.

From the SUPCASE product description:


  Front cover with Built-in screen protector prevents Scratches without compromising sensitivity