As I'm currently playing a ranger, PC Hero Myfirlyn log in Rutergin, I find this a bit of an abuse of mechanics. Areas where I should not be getting movespeed is occurring, such as inside Sanctuary, the Machine, the in-between ruins, and probably other areas. For some reason, it comes and goes, in example I transition into Sanctuary from the Gates, and I'll retain my movespeed, and afterwards keeping it where ever I transition to.
I don't think this is meant to work this way, would like to see it fixed.
I've noticed similar, mostly in Sanctuary.
I am pretty certain it all comes down to whether or not the areas you log in to can be considered wilderness or not.
Sanctuary and the Gates are not considered wilderness zones, however if you then transition to the mines and back you will find that your speed is as it is supposed to be.
I can confirm this happens when logging into the Watch House. Seems to last until you go to a wilderness area and then back.