Thanks, maybe this? But I had it already active previously.
<a title="Scroll back to top" aria-label="Scroll back to top" rel="nofollow" href="#" class="generate-back-to-top" style="opacity:0;visibility:hidden;" data-scroll-speed="400" data-start-scroll="300">
No, this is the back to top button, it is not related to the CSS I mentioned π
One way to test is to disable all plugins except GP premium, then activate the plugins one at a time, so you should be able to tell which one is causing the issue.
But it’s not a big deal as you just need to add one line of CSS to override it.