Why is my calculator showing green lines at top?

Why is my calculator showing green lines at top?

The top of my calculator has these green bar and some green lines at the top, and sometimes my font turns greens and all of the colors get weird on the graph. Red would turn orange, blue would turn some kind of turquoise. I honestly don't know what to do about it. I have already tried resetting my calculator many times and it will go back to normal but 10 seconds later it starts doing it again.