To fix the issue the doors need to be removed bottom of the jambs cut and reset the door.
Gap under wooden front door.
If you ve noticed a large or small gap on the bottom.
Make marks through the pre drilled attachment holes onto the door proper.
That is a lot of room for unlevel you have there.
A gap between the bottom of the front door and the threshold is easily fixed with a door sweep.
Position the gasket so it sits against the door tightly on the inside when the door is closed.
Door sweeps reinforce the seal between the bottom of the door and the door jamb meaning you get extra protection from dirt bugs moisture and wind.
I have never seen a door set with that big of a gap unless it was to get past floors that were not level.
Install a foam weatherstripping gasket around the door frame.
Remove the adhesive backing and stick.
The standard i use is 1 2 over finish floors 3 4 is acceptable.
Place the sweep at the bottom of the door and align the sweep edge so that it blocks the door gap.
Shim it and nail it and hang the trim.
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If you have a large gap at the bottom of your door that may be helping the door to stay plumb.
Pilot hole the marks.
The odds are you ll see a larger gap at the top of the door on the top edge that s above the handle or door knob.