Are you sure you're setting the mod correctly? Like in the correct case.
"OblivionParkour" would be incorrect, as the file doesn't have capitals.
The correct way would be
/set mod oblivionparkour.tbm
or if you want the other one
/set mod oblivionparkour1.tbm
Personally I advise using commands rather than the ingame mod menu, it works great on SP, but online it's pretty glitchy.