Card flip animation bug on Firefox browser

About 3/4 of the way through my site build (the 9th ‘section’) after the Course Curriculum header, I have 2 cards I built, which should flip when you click on the plus sign, and flip back when you click on the minus sign. These interactions seem to work fine in Chrome and Safari, but in firefox the glitch pictured below occurs.
As you can see, the front of the card is present on the back, including the minus sign, and both buttons then cannot be clicked or interacted with.

Any help greatly appreciated!

My read-only is: Webflow - PTYA