You didn't list the model and year which might help.
Inspect the seal all the way (top, bottom and sides) to see if there is gap, misapplied, loose, etc. rubber seal. You can also close the door with the inside lights off and look for light showing on the edge, better at night with a strong light on the outside.
If it all looks good, check the door to exterior wall for sealant. The door should be installed over some kind of seal to keep out rain.
If all else fails try the hose test starting at the bottom and slowly going up till you find the leak.
My guess, it's at the top and then runs down to show up at the bottom.
My front window leaked on the first rain at home. Top corner so bad you could see light outside! Went all over and checked and caulked every window and the doors. Dealer was too far to return for that service.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
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