I don't know what the length is supposed to be off hand, but it is supposed to be longer, similar to what you are seeing. You need to download the manual, unless you have one already. I think it has the procedure for installing the bearings. Install one at a time. The first one (can't remember if right or left) gets seated all of the way in against the lip in the hub. When installing the second one, you pull it in until the inner part of the bearing pressed against that inner spacer, then stop. If its pressed too far, the load on the bearing won't be centered and it will wear out faster.
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'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R