As BK says, the fork may be too rigid. You can probably just wedge them in anyway but it can awkward and inconvenient. You have only two hands..

A spacing mismatch on the rear can present a different problem, maybe. For best grip of the QR skewer you would like the DOs parallel when you tighten it down. On a lower-price factory model they may not be especially parallel anyway but squeezing the rear stays together or stretching them apart can affect the alignment and maybe create or exacerbate the problem. If you have trouble with the drive side of the rear axle pulling forward when you mash the pedals hard, this could be the reason. A lot of noobies who have this problem will post note after note in BF about how their skewer sucks and they need another one and they have to overtighten it, when 5 minutes at a good bike shop and not too much money can fix it. Or they could even fix it themselves.

In any case, measure things with a decent caliper, don't just eyeball it. And be aware your current or original wheels may not be such a perfect fit to start with.