I think that yours might be only normal and something that all homes have eventually. I have that, you have that and I am sure 50% of others on this post do to.
I would do as I recommend to others with this small of a crack, keep an eye on it and if it gets bigger then its time to check into it.
I would shim the door hinges, get out of order things in shape and not worry.
Your soils as a past resident of Shreveport, La, are always shifting around with the seasons, no slab could move that much and not crack a bit.
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