When applying any type of finish, READ the instructions on the tin! And follow them, they're there for a reason.
Didn't mean to shout, but lately on various DIY-forums we encounter the same 'problem' being posted: after sanding and applying two coats of HardWaxOil the floor looks patchy. When we then ask how soon after the first layer the second layer has been applied, most times the answer is: after 4 - 5 days.
Never, ever leave it that late between applying the two coats of HardWaxOil; all brands (be it Osmo, Blanchon or other) specifically write on their instructions: apply the second coat within 36 - 48 hours. Otherwise, the grain-hairs of the wood 'stick-up' and the floor needs a light sanding first.
Read the instructions, and when still in doubt: call for advice - every proper supplier has either a company sticker with contact details on the tin, or the manufacturers help-line is printed on it.