Thanks for posting about this — it definitely sounds like odd behavior.
Can you please provide a bit more information? Can you please share your Read-Only link?
When you said:
when I come back to the page after some time
Can you clarify this a bit? Do you mean when you have a page open in browser window, then come back to that window from another application after a certain amount of time?
Can you also send me a screen recording of what you see (CloudApp or Quicktime work well).
Could you also please let me know what browser version you’re using by sending me your information from this page?
There should be a small share link when you visit the page which you can send to me.
Thanks in advance!