Whats your field elevation and whats Eloys Unless you are above 3000 feet MSL anything the alti reads will show you being negative. IE 0 at Eloy (lets say 4000 feet), ship it to you at 2000 feet will be -2000 feet or 10k on the alti
The altimeter went down in elevation. Eloy is approx 1500-1550' MSL and Seattle is basically SeaLevel. If you are at one of the DZ's around seattle it would be higher or closer to zero on the dial since none of the DZ's here are actually at SeaLevel.
The altimeter was probably affected by the lower "end" location compared to its start shipping point. It also could be additionally affected by a barametric pressure difference.
Basically turn it the shortest didtance to the "0"