Nothing is wrong. The blooms are just beginning to fade. When they get dry and brown just snip then off just below the leaves and pups will form at the base of each plant. This will start a new generation of these Guzmania for next year.

If you look at stores that sell these ( I have seen them at Lowes ) the older plants look like this. It is just the fading bloom. The declining blooms tend to go on clearence at stores. If you are willing to only be able to enjoy the tail end of the bloom this can be a cheaper way to get Broms. At least that is what I have found.

Again, hotdiggetydam is correct, your plants have no problem except old age.
Have fun with the soon to come pups. You can divide the pups and get more blooms later!
L.G.