Ice forming very fast on top shelf only

Something here should cover your problem.
side by side refrigerator ice on freezer floor YouTube

The door gasket is leaking around the top of the door. Air getting in past the gasket condenses in the freezer causing the ice build-up.

your freeze have cooling matchine problem.

Look on the back of the unit for a plastic hose coming out the bottom to a drain pan usually sat on top of the compressor. Bend a straw and push up inside. If it won;t go, there is a blockage, usually ice in the drain. Fully defrost the freezer and blow through the straw until clear.

https://www.repairclinic.com/RepairHelp/Refrigerator-Repair-Help

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I’m happy to assist further over the phone at https://www.6ya.com/expert/david_dc2f9e0a44104720

Hi,

On this unit the shelves are the cooling coils and carry the refrigerant (freon) through the system. They will attract the warm moist air by design, so if you have an air leak in the door or elsewhere it will tend to build up there first.

This being said you need to check something else first. Make sure the other shelves are cold. If they are frosted and cold like normal then you most likely have a door that is not closing all the way or a bad seal. If the lower shelves are not cold then you have a system problem, typically a refrigerant (freon) leak that is causing the top shelf to absorb most of the work and not enough refrigerant to flow to the bottom shelves.

I hope this helps

try a total defrost,to clear any internal ice(every 12 months)then switch on and if you have a rapid freeze button leave on for 24 hours to get back to normal operating temp.if you have hard ice around the door seals then you have an air leak which you must sort out(try using a hot cloth to warm seals back into shape.....seals should fit all round, all the time.

You should to check the Whirlpool Gladiator Freezerator's door sealer to make sure all rubber or plastic seal very well to prevent air humidity come in to build up frost fast. Also, you have to defrost completely and wipe with cloth or paper towel to absorb all waters out and let it dry completely to prevent frost build up.

The door seal is at fault. Regardless of the small tear it is not sealing well.
Take a dollar bill and close it in the door. Then pull on the bill to feel resistance.
You will find it pulls easily in some place. That is where your air leak is that is causing the condensation.
Do this about every 6 inches all the way around the seal.

IT SOUND LIKE YOU HAVE AN AIR LEAK IN TOP OF GASKET,THE GASKET HAS A MAGNET IN IT ,YOU CAN USE A HAIR DRYER TO SOFTEN THE RUBBER UP TO SEE IF YOU CAN GET THE SEAL BACK TIGHT,BE CAREFULL NOT TO BURN THE GASKET OR YOURSELF,THANKS-MIKE