I just noticed after I got a hotfix last night warrior deep wounds does not seem to be stacking properly. It applies deep wounds when I crit but does not seem to be additive to existing deep wounds, it just resets the dot as if you only crit once.
This has been confirmed by several players over in the WOTLK forums as well.
This only started happening after the client was updated to version 3.4.1.48120.