[Mainsite] Chapter not marked as read despite having already read the chapter.

[Magami]

This has been happening once or twice in the past few weeks, where even if you have read the chapter or have marked the chapter as read, it still doesn't mark itself as read after refreshing the page.
I'm on firefox if that's relevant.

 

[BraveDude8]

Read markers occasionally get delayed for half an hour or so when the site is under high levels of load, which happened a couple of hours ago.