Sometimes webbing that holds metal buckle stretches under load, and it gives room for buckle to rotate. In that case there’s a possibility of webbing damage caused by angle load.
To fix that make two stitchings at the sides of the webbing just below the buckle. Each stitching contains three turns of super tack cord with two overhand knots at the end.
Download the instruction here: Product Improvement Notice - Buckle Rotation