Well this is how the bug occurs, I can be swifted speed potted or not. For example spells like blizzard and leg cut( any spells that reduce running speed) I am slowed, I can cure it but yet the spell timer flashes at 0 seconds and does not go away. Only way I can fix it is if I receive another swift, but with speed pots its quite annoying(have to leave the area for it to be gone). Also at times when the timer flashes at 0 I get disconnected.
Things I have tried to fix this, re-install ko. Delete the data folder for the spells, then re-install.
I have another Idea that could fix this but if anyone else has had this problem please leave a post and hopefully I can get this fixed.