Phone vs PC link? Marked as read

[SSGNRDZ_28]

Why is it that when I check a post on my phone it doesn't show up marked as read on my PC and vice versa? Is this a setting I need to change or is this something that happens for everyone? I'm just using the web browser on my phone and haven't had this issue with other forums.

[VPRPWRD]

Mine is the same, for multiple forums that I frequent. I am unaware of a setting that can be changed.

[Web Driver]

vBulletin sets a cookie with a date stamp of your activity. The date stamp is device dependent, and is not shared within the account. I'll look into hackin' that once things have slowed down.