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Shrinking rubber??

Here's a side by side stack of 315/30/18 and 295/30/18 R6s on 18 x 10.5 and 18 x 9.5 Enkei wheels. One stack is 3/4" shorter than the other. The only difference is the shorter stack was used for 3 days and the taller stack is a sticker set. WTH? I noticed this on the last set as well.

20140816_125041_zps953b3d4f.jpg
 
Are the tires on the shorter stack now taller? You should send those to me for testing. ;)
 
Not that this is the solution, but when I stacked identical tires that were mounted next to ones that were unmounted, the mounted were shorter. Whether once you unmounts these tires, they will retain this characteristic I cannot answer.
 

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