troubleshoot this wierd radio issue

[irondiezl3]

ok long story short, kenwood kdc-x997 brand new i have a 4 channel amp and sub amp all work great. when i turn the internal radio amp off i lose my sound now heres whats wierd the amps stay on radios on just no sound, i tripple checked my wiring its all good. this is where it gets wierder if i turn internal amp off while cars on my sounds is on once i turn the car off and back on sound is gone. now with internal amp on the sound never turns off. i should be able to turn my internal amp off like i have with every other radio on the past. i cannot figurte out why its doing that any ideas? i dont have factory amp or onstar from stock radio its just my 4 channel my sub amp and my head unit.