When the bikes are shipped, a plastic disc with a post is inserted into the front axle to help prevent shipping damage. Sometimes, the disc breaks off while in transit, leaving part of the post in the axle.
This blocks the hole, inhibiting the quick release skewer from passing fully through the axle.
To resolve this, simply insert the skewer into the axle as far as it will go, then push or tap it gently to knock the plastic post out.
