Should I approach the team about this?
Yes, certainly. It sounds like some/most members of the team don't understand the stylesheet architecture of your project and it's vital to sort that out ASAP. The more time passes, the harder it will get to get everything back on track.
Try to avoid finger-pointing and this shouldn't be a very hard conversation (assuming they aren't super stubborn).
As a side note, the fact that you first address this issue on the Fediverse and not in your team makes me think that maybe there are some underlying issues regarding trust and open communication. You might want to further look into that. Take it with a large grain of salt though. I don't really know anything about your team so it's likely that I overdramatize the situation.