On the original LCD there is usually a thin layer of foam ur new LCD may not have this… if u have it transplant it over to the new one if not just cut thin strips of foam u can buy a4 foam sheets its usually about 1-2mm thick…
Also check ur new battery isn't swollen or fat and theres nothing under the LCD and the adhesive uve used for the battery isn't making it stick up more than it should :)
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Another cause for this is sometimes the iPad being bent or twisted take the digi and LCD off and place the iPad face down on a flat surface and look for any signs of bending.
On the original LCD there is usually a thin layer of foam ur new LCD may not have this… if u have it transplant it over to the new one if not just cut thin strips of foam u can buy a4 foam sheets its usually about 1-2mm thick…
Also check ur new battery isn't swollen or fat and theres nothing under the LCD and the adhesive uve used for the battery isn't making it stick up more than it should :)