Hi Brent743,
I don’t know anything about the mattress you purchased so I really don’t know what would be “normal” for your mattress but some mattresses are zoned and can feel firmer in the middle. It’s also common for someone to “feel” something unusual when they are first sleeping on a mattress that is different from what they are used to. For example your old mattress could have softened in the middle so a mattress that wasn’t softer in the middle could feel like it was firmer in the middle to you so it could also be something that you are “feeling” even if the mattress itself isn’t actually firmer in the middle. There is more about the normal break in and adjustment period with a new mattress in post #3 here.
Phoenix.