[amsat-bb] AO-73 QSOs on the beacon?

During the eclipse passes while copying telemetry with my Funcube Dongle Pro + I am hearing SSB QSOs on the beacon frequency. They usually "walk" across it but what puzzles me is that the website info indicates that the transponder passband is well away from the beacon frequency. Am I experiencing some weird stuff with my Dongle or is it possible for stations to work on an uplink that puts their downlink on the beacon frequency?

Thanks, Jerry N0JY