If you have 2 buffs and then try to take 3rd or 4th, you'll see that 3rd will show itself, but incorrectly sized, and 4th wont even show up.
Tested only in "Testing area"
Window size = 1920x1080
But like you said, it only displays 4 buffs (rejuv + buffs), the fifth one it's not even shown in Panorama...
Maybe it's intended because you can get maximum 2 Bridge Buffs and a Rejuv Buff.