This idea was brought up in https://github.com/backdrop/backdrop-issues/issues/1169#issuecomment-139... by @sutibun:
Loading comments via AJAX is a better idea. Anything using JS is a better implementation because bots have a harder time with them.
The Antibot contrib module does this.
GitHub Issue #:
1592
Recent comments
OMG thank u... you are amazing.
Hiding Blocks for Small Screens
I use a similar module (Tocbot) which uses the same library, but the implementation is different. This is what I use to target the block: @media (max-width: 47.99em) { .js-toc-block.is-...
Hiding Blocks for Small Screens
So the implication is that another module is causing the trouble. Now for the slow process of elimination... Sounds plausible. And good luck with digging...
How to troubleshoot interactive image cropping modules?