@joanie21836 Your code seems correct, I assume you are testing in Preview mode? I’ve found that collapsing elements behave strangely in Preview but work well on the Live site. There have been many times where I’ve had to rebuild my collapsing element after testing in Preview, I’ve given up on it and only test on Live now.
I know it’s not a very helpful answer, maybe someone else has a solution! Or maybe bring it to the attention of Wix Support.