The skirt has diagonal creases from the centre front waist to the side hip and the grain on the hip line is curving up at the centre.
This figure needs more length on the centre front line than has been provided, and may also need more width.
Release the skirt from the waistband and allow it to drop. This may correct the fault; in which case the skirt only needs extra length at the centre front. Measure the amount that the skirt has dropped and add this amount to the centre front waist, curving to the original side waist (diagram 1).