Paladin's block seems to be bugged.

[Espon]

This is a common process during levelling encouraging getting the highest level shield available at each level if you want to get as much blocking out of it.

At each level cap (50, 60, 70, 80, 90, 100) the power will be normalized to 20%. This process is as old as ARR and is a nice reminder that we used to have shields with different block power and rate.

Uh, no. I'm referring to the fact that level 91 to 100 shields still have 1267 Block Strength and Rating, just like level 90 shields.

Notice the difference between the level 80 and 90 shield. Now look how it doesn't change between the level 90 and 100 shield. This is why paladins only block 16% damage in level 100 content compared to the usual 20% when max level.