Haste bug?

I log out and I have 5% haste, but when I enter combat I go up to 6.05% any explanation for that?
Funny that you mention this. I have noticed that my haste % will go up from time to time for whatever reason i can't figure out. Same with my mastery. Makes my OCD kick in hard
Hmmm, I am thinking it is because as you log in you are standing in one place and therefore get your standing still SV haste buff. However when you log out you have been running around and haven't been still enough to get the SV haste buff back yet.
It's either that, or you are changing specs or gear at some point and see a difference.

If neither of these things, then idk, you be bugged or something mon.