I just started going tanning last week and started with the beds. First time i went in a regular bed for 15 minutes, and it didnt really do anything. Yesterday i went again in the same bed for 20 minutes and every part that was touching the bottom of the bed is red now,(back, back of my arms, ass, back of my legs/calves) but everywhere else is only slightly darker. Is that just how beds are? Should i just use the stand up next time?