It may be related to the anticipation of the government shutdown next week See page 2 of this document:
https://nfipservices.floodsmart.gov/sites/default/files/w-23012.pdf"Any quote provided during a lapse is for informational purposes only, is not binding, and is subject to change if the lapse ends and the authority to enter into new flood insurance contracts is restored."
A WYO company may not bind a NFIP policy anyway, only the NFIP can do that, so as long as the NFIP application is completed appropriately, I would not lose too much sleep over it.