The effect command for speed dosent work on multiplayer

What I expected to happen was...:
For the command to trigger and cause my charechter to run faster

What actually happened was...:
It says its been triggerd and shows up as a valid potion effect you have in your inventory but has no effect on the speed of your player

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. Place a command block down anywhere on a multiplayer server
3. Enter into the block : effect @p 1 200 255