Attach to Products Problems

Hi Admin,

First of all, thank you for your superb work on these products variations. have been using them for almost a year and it’s been great.

However today, I cannot really add or remove the product options on the “Attach to Products” button. the word “Add” and “Remove” are still there, but I cannot really click it whatsoever. It’s just like a simple text, not a button that I can interact with. Please kindly see the attached files for the screenshot.

Any help would be appreciated, thank you very much!

The page I need help with: [log in to see the link]