Hello,
I've run into what I think is a bug that only happens on some browsers / devices. When using the small checkbox ("check"), some users can check the box but no check mark actually appears. However, internally, the box is checked. Sometimes the outline of the small check box changes colors (indicating it's been "checked" or unchecked).
My solution was to replace the small check box with the big check box ("check_button") since that seemed to work when the other one didn't. This problem only happened on Apple devices (not all of them), and on my iPad it happened on both Chrome and Safari.
I think this might not be a very frequent problem, but I couldn't find anything on here about it, and since these types of check boxes are often used in consent forms (that's where I have mine) it seems a little more important than usual :)
I hope this is helpful!
Best,
--Julia