I know that there was some complaints on other web sites about Pegas blades. I think there was a a bad batch. Not sure the size the problem.
Contact who you bought them from to see it they will replace them.
I purchased one package of 12 to test them. When they worked, they worked very well.
Had the last one in the saw today. It has been used, cut fine. Flipped the tension lever, and after a few seconds it snapped. On its own, never applied power to the saw at all.
I also have some Flying Dutchman 2/0R. Just started using one of them. They feel a little heavier - have not measured them yet. Big test will be if they can go through the hole from a number 70 bit. Used it a bit, and had trouble getting used to how it cuts, but it pretty normal.
Not going to worry about getting a replacement, all the broken blades just went into the garbage.
I also have some Pegas 2/0 Modified Geometry blades. I am a bit concerned about how well they will stand up.