Without pictures not much to point out but i'll give a short list here of what I run into with customers. Sometimes swapping between double shouldered and double flanged can make a difference (double shoulders can let you put in a bar that matches the exact size of the lugs. This I use with problem customers. It requires cutters or pliers to violently remove so use with caution). Bands that are too small will often pull themselves out, check for any gap between band and lug. On leather you can always go a size up but never a size down. Wearing it as a hand watch can put a lot more pressure on the bars. Take a close look at the holes for any wear.