Weird question but my boxers waistband constantly slowly creep up my waist so if I take off my shirt you can see my boxers even if my pants are on

Ok so to elaborate on the title my boxers like to ride up my waist. I put them lower than my pants when I put them on in the morning but they slowly creep up and eventually you can see that they are above my pants and I don't know the cause. Can anyone help?