Your front wheels stay on the deck because deceleration transfers load (weight) onto the front wheels. (If you twist the wheel while standing still the outside front wheel lifts)
If you accelerate through or out of a slow corner you transfer weight to the back. This lowers the back wheel and inertia keeps the outside front on the floor, raising the inside front.
Since turning is itself a deceleration (Acceleration is rate of change of position in a straight line, since you are not travelling in a stratight line you are decelerating) what raising the inside front usually means is that you are travelling in a straight line at that point,(Both rear wheels on the ground) with the inertia of the turn keeping the outside wheel down.
If you are a believer in the 'turn,straight, turn,straight' method of getting round a corner then you are theoretically travelling faster than a constant turn keeping both front wheels on the ground.
It is a valid way of getting round the track, and you often see it used by people in corners to lift a front wheel over the kerb rather than impacting the kerb. (an impact loses speed, a lift doesn't).
Unless you are also getting understeer, the front outer sliding, you aren't losing any time. It should be a very temporary phenomenon too, the wheel returning to the ground as the forces stabilise (otherwise it might mean that your kart is staying 'bent' from the last curve it went round, not something you expect in a new kart)
Yes, it can be adjusted out, but it is a compromise. Widening the front track (increasing your scrub radius)merely means that you are 'lowering' the inside front by the amount that it is currently lifting.
However going wider at the front means that you have altered the turning characteristics of the kart, which may improve laptimes or not. If the kart is currently balanced, you may need to alter the back as well, since altering the front will alter that balance.
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