Many razors have slightly warped blades. Not saying it is a high percentage out of all of them but it is not unusual whether vintage or new production. Marker on the edge can help determine the stroke that works efficiently to sharpen such a razor.

The rolling x, narrow hones , the 45 degree heel leading stroke are all potential solutions .... if you know what you're doing. Trying to correct a warp by wearing the spine and edge relationship is not a viable solution IMO. YMMV.