big problems about vbb (hacked or bug?)

[linhhon2003]

i had big problem :my post in my forum s been del . i dont know why ?.ony sticky posts isnt deled.
i 'using vbb 3.6.8
host : blue host.
about mods i use on my forum :
Cyb - Advanced Forum Statistics
Cyb - Attention Zero-Posters
Cyb - Check If Already Posted
Cyb - Sub-Forum Manager
External Link Titles
Fake Users
HELLCATs Realtime Page Compressor
Inferno vBShout
nCode Image Resizer
Members who have posted on the forum
Post Thank You Hack
Miserable Users
Plugin Based Template Cache
Separate Sticky and Normal Threads
Simple attachments Rules
vbBannerRotator by Frapegliko
vBRecycle
VietOnLine?
WildSharkys Header News And Announcements

i need ur help thanks

[Dismounted]

A vulnerability probably exists in a modification you've installed. Unless we look through each individually, we won't know which.

Have you got a backup of you database?

[linhhon2003]

yes i ahve backup . but it happened 4 times :(

[Dismounted]

Get rid of all your modifications.

[Marco van Herwaarden]

Also check your Admin and Moderator logs in the AdminCP to see if it is maybe done by one of your staff members.