Dear Almah @almah
Your Project Thumbnails are always in their 'Mouseover state' on Mobile (hover):
Screen Shot 2021-03-09 at 9.08.36 PM.png
When "Brightness 17%" is removed your mobile layout displays fine -
Given that further down in the Project Thumbnail options there is > Behaviour on Movile Devices > Always show mouseover state:
Screen Shot 2021-03-09 at 9.17.22 PM.png
I would assume that this is checked and needs to be 'un-checked'
Best wishes & have a wonderful day :)
Richard