FPS issue during conversion to MP4

Hi. I've recorded an Adobe Connect session. When I go to make offline (in MP4 format), I select the Full HD option and make no changes to the advanced settings. The converted file is only coming out at 15 FPS, not the 30 FPS that is shown in those settings. Any thoughts on why this is happening? Quick feedback appreciated--we are hoping to use this for a work recording in the coming weeks!