Not every difference is a contradiction. This issue, like all other Catholic/Protestant disagreements, depends on whether or not there is a living Magesterium, or whether Scripture alone is the sole authority. For if there is a living Magesterium, then it has the authority to make certain kinds of changes as necessary. Also, there are other rites within the Catholic Church in which priests can be married (and bishops I presume, but I'm not sure about that -- somebody who knows please correct me if I'm wrong). That shows (if true) that the requirement that bishops be unmarried is not a universal Catholic dogma.
Is your bishop married?
-A8