Did you put extra leather along where the rivets are located, basically shaped to the curve of the knife (called a welt), or did you just rivet the folded leather pieces together? What a welt does is it give the blade a soft leather piece to rest on so that it doesn't rest on and cut the side pieces or the rivets. Not sure what your leather thickness is, but it would be best to be 2-3mm to give it some rigidity and strength.
Next/now, we need to see the all leatherwork projects that you are going to produce.
Rob P.