More troubleshooting is likely required here. We need to eliminate the possibility that it could be an issue with your style, your add-ons or other customisations on the page.
So please try this on an unedited default style with all add-ons disabled. You have ads on the page so please ensure they are disabled too. It's possible one of those things may stop the issue from occurring.
If issues persist, please let us know whether you can reproduce the same issue here and also let us know exactly which device you're using.