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It sounds as though the unit is set up for "6-channel" surround mode, but you don't have a center speaker. That means the audio sent to that speaker isn't being heard. You'll need to get to the audio setup menu, and either turn off the 6-channel mode, or turn off the center channel option.
There are two different Jensen models with the VM9510 model number, but you can download an owner's manual for either one here:
It sounds like the "memory" power wire is not connected. This is a separate wire coming into the stereo that is always connected to the car's battery. It is not affected by whether the keys are in the car or not.
You will need to locate this wire, and ensure it is connected to an "always on" circuit in the car.