Guidance volume vs. Music Volume

Hello. Whenever I connect my iPhone 11 ProMax into CarPlay it will not let me adjust the regular music volume but will get stuck in the guidance volume. I’m not sure how and why this happens. If I use a different phone it’ll work ok except my phone. I already tried using a new cord and resetting both my car and iPhone system in hopes that it’ll fix itself. I’m not sure what else to do at this point.