Could this be a reason for delayed October bulletin.
https://www.uscis.gov/archive/uscis-...aiting-to-file
Looks like USCIS is revising the procedures for determining visa availability for applicants waiting to file for employment-based or family-sponsored preference adjustment of status. The revised process will better align with procedures DOS uses for foreign nationals who seek to become U.S. permanent residents by applying for immigrant visas at U.S. consulates and embassies abroad.