As others have said, low air pressure is the most likely cause.
However, tires have been known to creep, especially fronts as in your case. And, yes, fronts creep because of braking, and while rears rarely do because both brake and acceleration forces are lower, and in opposite directions.
Then easiest way to cure front tire creep is to flip the wheel, and let it creep back home. Of course this won't work with disc brakes. To stop creep, remove the tire and thoroughly clean the rim's bead area with a zero residue solvent, or detergent and water. Likewise use water/detergent on the tire's bead area. Then mount DRY tire and you should be fine.
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