Sorry that I didn't state the problem completely! (and late response!)
The issue is that when the player sprints his speed remains the same as if he wasn't sprinting.
I believe that the issue is caused by
ClassicGuzzi's Deathrun Redux, because there is a part in the Deathrun plugin where you can set the REDs speeds as well with BLUs. Which I have no intention on allowing BLUs to sprint, only REDs.