Most karts develop inside tire wear, as the chassis flexes and develops negative camber through the corners, and the rear tires as well, since the axle flexes too.
Some tracks are harder on tires than others, depending on how aggressive and tight the corners are, and how small the track is. There’s also a possibility that your toe is way out ( it happens quiet bit) It is very important to snipe your front end before each race.
Please give us more description about your track, track condition, your alignment set up ( where your tow, camber and caster is ) Please let us know how many laps or sessions you do before this happens. If it happens in the first few laps etc. Or at the end of the day. We will help you get it narrowed down, and some other guys here will also give you good advice. Thanks, Fast Freddy.