I already sumbitted a ticket about this and it was suggested to me to also post the bug here!
The movement speed bonus that is granted from azure/brutal enchants and the SH guild boon has a bug on my toon.
Pressing TAB or even moving and pressing the shield button makes the toon lose its bonus speed (azures/brutal/sh speed boon) when the indication "IMMUNE" is displayed on my screen. Removing a gear piece or the SH boon and re applying fixes the issue (until you press TAB and happens again..) but this also happens in combat!
Also while using the elven enchant i can see my toon moving slower! Is this because the new movement bonus in azures and the guild boon is coded like a "negative slow buff" ?