The ChaseMechanic and Duell Maps
I and a lot of other players experience random speedboost on this map for a long time.
I beleave that even though you cant see the other players on your server they still trigger your chase mechanic.
This is also consistent with the bug allways occurring right after you spawn then its most likly that someone is walking invisibly infront of you
This isnt the most crutial bug but it has been arround since duell mode was introduced
I have noticed this as well. Moving thread to the appropriate subforum.