Apple car play music only playing in front speaker????

hello everyone. this is a new problem to me cause my bad azz 2015 sr5 didn't have apple car play so when I picked up my 2024, 1794 Limited Edition number 716 on Monday the 29th of April I hooked up the blue tooth and started to use the blue tooth for the music. I only heard it from the front speaker and I was thinking man this JBL doesn't sound good at all? lol so then I played music under the Toyota app I was blown away with the sound. so my question is this. has anyone had this problem and how do I fix it? I also hooked up a USB port to play it and again it was the one speaker. so any help would be great .
have a blessed day
jonathan