Firstly what a lovely website ⭐️
I made a similar setup (albeit crude..) and do not experience this issue:
I notice you are using version 3.8.5, are you able to update or possibly you are keeping this version for reasons with SEO?
Would it be too difficult to do a test with the following environment?
Any custom CSS or JS that may interfere is temporarily removed.
Any third-party plugins are de-activated to see if this resolves the issue.
If you wish to update please do 🌝
I see it's related to the
z-index of cover and content, does this relate to anything for you?
If we give "cover-content" a z-index of 2 the we get the desired result:
Talk soon & have a wonderful day