Happens to me as well, only when I click chapters from my RSS feed, though. Seems like eager referer policy to me.
EDIT: after looking more into the issue with batoto's RSS feed it seems that it produces HTTP links, not https ones. Why it's bad? Scripts on direct HTTP pages may produce XHR calls to HTTPS resources. Some browsers and/or combinations of addons will abort them because it's both unsecure and plainly stupid.
FURTHERMORE - similiar situaction occurs the other way as well - HTTPS pages loads unsecure HTTP resources. See: https://i.imgur.com/BvZggI3.png. It's called mixed content and it's bad.
This may be wrong place to say these, but please infor your code magicians to look into it.
Edited by usage, 27 October 2017 - 08:51 AM.