Why is my stereo so quiet?

I have a 2020 Kia Sportage. I can turn the stereo almost to max and it's still barely loud enough to hear if I have the windows open. Doesn't matter if it's the radio, bluetooth, or wired in. I switched out the deck with another standard stereo and it's the same problem. When I put an aftermarket deck in, it's way louder, but the deck isn't the same size and it's not fully compatible with the steering wheel controls, otherwise I would stick with that.

I feel like it's in 'attention' mode or something, but I can find any settings to change it. Any help would be appreciated!