ok I'm lost! my razors lose their edge fast and I don't know why

Ok i have searched and searched and can't find anything. it seems like my razors lose their edge surprisingly fast, after about 4-6 shaves. I have 3 razors but just added another yesterday. My new razor which went from my best shaver, seems to have lost some of its sharpness after one shave! I have been shaving with a straight for 6 months now and I feel like my technique is good but not great and I keep changing the amount of strokes I do on the strop to see what works best but haven't noticed much difference. Currently I go 20-30 on linen and leather pre and post shave but have gone up to as many as 60. The strop I have now is a beginner strop that is nothing fancy. I have honed a couple of my razors using lapping film which gets them smooth and sharp again for a short while. Sorry if it's a stupid question but im lost on this .



Thanks in advance!