And to help us help you, provide a clearer (more detailed) description of you physical connection from audio sources to streaming computer (OBS). For example, are you using church sound system/microphones? if yes, how are you getting audio signal from sound panel to computer?
And are you aware of OBS's Advanced Audio Properties of Monitor & Output? look into if not, and make sure you haven't set you Audio source to Monitor (ie hear on PC speaker) but not output to stream