Question about switching from winter to summer tires?

I had my winter tires removed yesterday and my summer tires put on. I drove to work this morning and it sounded like a had a flat tire. I got out at the stoplight to check and all the tires looked fine. The tire pressure was checked and was fine. My car still sounds like there’s a flat, and the rear shakes…any idea what this could be?
It’s a newer Mazda 3 if that makes any difference.

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