Philip W. this took some digging. Basically it looks like you may be retrofitting Relume into an existing site, yeah?
Aside from that, there appears to be a Button class - take note that the B is capitalized. Now this is kind of silly on Webflow's part - it considers that a new class but CSS doesn't care about capitalization. So this class is conflicting with button and instead of preventing the situation, its just crossed out (or inherited) those properties from that original class. My advice would be to rename this old button class to something else, if you want to continue using Relume components for this project.