I wonder if anyone else has seen this before...

I have several razors which hold their edge pretty well. I can shave and strop and they continue to shave well with stropping, but..

I have this one razor which dulls to the point where I cannot get a close shave with it before I finish my shave. In preparation, the razor is sharp and passes HHT but then shaving begins, the razor quickly dulls to the point where it is difficult to finish with. I have resorted to stropping again mid-shave to get the edge back to a point where I can finish up.

Anyone seen this before or am I the lucky one?