When ever a player is over 2 blocks high in the air they are teleported to the ground

[Kryptanyte]

Title: When ever a player is over 2 blocks high in the air they are teleported to the ground

Version: 3.1.2

OS: PC mainly. Haven't heard from anyone on a MAC on this server

Java Version: Varying

Description of Problem:

Basically whenever a player jumps higher than 2 blocks, flies higher than 2 blocks they instantly get teleported to the ground. If the player is in creative or has op they do not experience this issue, the same with /fly. We have flight enabled and also have disabled towny's cheat prevention thing.

Error Messages:

Error Log:

[Syndrogo]

Can you give a list of server mods your using. Also your copy your logs and paste them into the forums.

[Kryptanyte]

Server mods or plugins? Also there is nothing in the logs to say that its teleporting players down. I'm waiting for it to happen so I can double check

EDIT-Just tried it with quantum jump, nothing is appearing in console about teleporting me to the ground

[Syndrogo]

So your not running any Bukkit Server mods?

[Kryptanyte]

Not as far as I know. I only just started with the server. The owner wasn't doing anything about the glitch so he gave me access so I could. This issue has only occurred between our last map reset and this current map when we added in towny, logblock and vault I think.