pull to refresh odd behavior

Hi, let me describe my problem: I enabled pull to refresh gesture function and until recently it worked great. But I noticed odd behavior recently: To activate pull to refresh, one should "pull from top", right? But if I just drag from middle to top to just scroll through website, it refreshes as if I pull from top. This happens only when I moved to new pages. For example, I clicked a post in reddit to open that post >> the post opens, I try to scroll the page to see post comments >> and boom the page refreshes. After that this won't happen in the same page. I hope to find solution and currently disabled pull to refresh. Thank you.