anyone give you a random item? could be a book or somethin... maybe a hacker, but thats highly unlikely. which gamemode is this on? and what random places? warps? spawn? wilderness?
No point in asking all the gametypes until he responds :> On the most basic level, maybe he's clicking the items in the menu that takes you to the different gametypes, and when he teleports that is confusing him?
If your teleporting just a slight bit like 3 blocks away it's just lagg sometimes if your fully teleporting then someone is in vanish mode teleporting you to them witch is most likely to be a troller if that's so it would have been a staff member witch i don't think would do that thanks for your time
Unfortunately we can't help you in a situation like this, no information is given. If the problem is persistent, please make another thread.