Post title being changed in SERP from the usual post title to "[number of comments] thoughts on...[Post title]"

I've noticed for a few of my blog posts that the title is being changed on the SERP.

On the results page, the title doesn't display as the usual post title, but "145 thoughts on [post title]". (the post has 145 comments).

Weirdly this is only happnening on mobile - on desktop the title looks perfectly normal - none of this "X thoughts on..." business.

Is there any way I can stop this happening? Everything looks normal in my Wordpress settings (including all SERP previews).