MATLAB GUI Collides when using big matrices

I don't know what causes this but I get this kind of window when I am working with big matrices.

After I switch to the different window and come back to Matlab GUI again, it disappears. However, if I scroll down on the GUI, I get the same collided window again...

P.S. I am using Matlab R2015a on Ubuntu 16.04

Edit: The matrices' dimension was around 16000x30 (not that big actually)