Hey there,
I have a simliar problem with the dropdown on the product pages. If the product information is too long, you can't reach the size L or XL in the dropdown. I tried all the Variation Swatches Plugins to change the dropdown to boxes, but it doesn't work. Do you have any idea for that problem? Or did you think about showing variants in other ways again? :)
You can see the problem here: https://sleepovereurope.com/produkt/pinstripepants/
P.S. I know the problem wouldn't exist if the text on the right side wouldn't be sticky, but I think its quite usefull to see the information while scrolling through the pictures on the left.