(Amazon Affiliate Link) As an Amazon Associate, I earn from qualifying purchases. - linktr.ee/frank067 Shure BLX288/PG58 H9 | Two PG58 Handheld Microphones Dual Channel Handheld Wireless System amzn.to/3DEa9MC
You can adjust the gain on the microphone by opening the the handheld part. Hold down the channel button for 5 seconds. Once a dot appears it's set to minus 10db. One of your mics must have come setup this way. Holding the channel again for 5 seconds will remove the dot on the display and set it to normal gain. I hope this helps.