I don't know if I would characterize there being "problems" per se, because these two roles work very closely together. But I think the biggest challenge between them is that they simply have different goals sometimes. Making something beautiful vs. accessible could be an example, and finding that balance is where you can really make a product shine.
My only suggestion would be to communicate more. Try pair programming/designing and discussing in-person (or on-video) the reasons behind your thought process or decision making.