why are upper case letters automatically converted to lower case?

[ahmedbehiry]

Hello everybody

I've noticed recently that any upper case letters in posts in my forum are automatically turned into lower case letters..
is this because some settings of the forums or som plug in that I'm using?

can any one help me please?

[Dismounted]

I believe there is an anti-shouting under vBulletin Options that does this.

[ahmedbehiry]

I found the reason.. it's the word replacing plugin.. I disabled it.