This is correct Alan. Even Springfield lists it as a compact, probably because of the extended grip. But normally 3" or below are considered "Sub Compact" pistols.

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Hi Alan, They're all Sub Compacts. Just misprinted. Sorry for confusion. You can see here with the 3.3 model. budsgunshop.com/catalog/product_info.php/products_id/3906/Springfield+XD%C2%AE+MOD.2%C2%AE+%E2%80%93+3.3%E2%80%B3+Sub-Compact+Model+.45ACP

springfield lists the 3 and the 3.3 inch barrel as subcompacts (they don't list a compact at all) the .45acp has a 3.3 inch barrel not a 3 inch (maybe a discontinued model) I would contact Buds customer service (859) 368-0371 9am-9pm mon-fri or use the blue Chat Now button and ask
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springfield-armory.com/xd-series/