I had a problem with that when I first got them and found out that I wasn't pusing them on the handle far enough. Also if you hold too close to the blade and choke up on the handle too much your fingers tend to push the blades off. When I held back further on the handles... no worries. Since I changed those two things, I don't have that problem.

Move the handle laterally so that one end of the blade comes out first.

I have no issue and have been using this product for quite some time. So unfortunately. Yes maybe its you