Only able to walk, not run?
So I’m nearly sure you’ve set a key to “Walk” which will make your character very slow. You’re probably accidentally pressing it, and when it fixes itself, you accidentally press it again.
Look at your keybinds (F11→ 4th tab on the left, Control Options) and in the first section Movement, there will be a Walk option, figure out what that’s bound to.
I think Da Sonic’s probably ID’d the root cause (accidentally toggling run to off).
In addition, movement speed in combat is reduced substantially and you remain in “combat mode” until you break aggro from all foes and all conditions and effects have expired. In Orr, there are a lot of areas that have semi-permanent environmental effects — you have to get far enough away from any corrupted statues and then wait for the effect to wear off.
In orr some of the enemies actually give you permanent cripple, it is a bug that will hopefully be fixed soon. If you don’t have a condition cleanser, you’ll be stuck in combat with it until you relog or someone kills you.
The walk/run toggle key is useful to have set anyway for dealing with enemies that like to use fear.