Walkspeed/Runspeed is broken thanks to custom gamemode, Stays after removal!

Help me! I have a serious problem.
When I was learning Lua, I had one particular gamemode which changed Player’s default walkspeed and et cetera.
I removed it back then, but the Walkspeed/Runspeed were still there!
Also, Nothing can change the values. Not HL2Settings, not DarkRP or other gamemodes.
I hold Shift and Alt to walk instead of Shift being sprint, and normal walking results in Acceleration to ridiculous speed! Also bunnyhopping.
Does anybody know how to destroy my custom speed completely and return the defaults?