My buttons changed somehow, how can I change them back?

Site URL: https://www.salastina.org/concerts

Somehow the buttons for upcoming events on our "Next Events" page changed to black with white words. Our original buttons are still showing on past events, however. I'm including images of the two buttons. The settings for the buttons in site styles hasn't changed. Does anyone know how to change the black buttons back to yellow buttons? Thank you!

Squarespace changed their naming convention for buttons from Small / Medium / Large to Primary / Secondary / Tertiary and I think there a slight issue here as when I look at the code for those buttons they are classed as Primary. You could check all of the button types and see if you can find the color there, maybe in the design menu you can find where the button styles are attributed (you can often set these type of buttons to be any of the style types) and if none of that works, I can give you a CSS snippet to fix it.

Thank you so much! I *finally* found the button type and updated it in the custom CSS section.