Product description glitches

Hi , I'm trying to add a product description to the productpages, but there seems to be a problem with displaying the content correctly. It starts of allright, but after a few scrolls all the text falls into each other, as you can see in the picture.

I talked to the chat Brian and he mentioned that there’s no word limit, so that should not be the problem. I’ve also tried switching between the visual editor and the html editor, because Brian advised me to do so, but the problem is still here.

Could someone look into this problem/glitch to see if it can be resolved?

Many thanks.