A chippy edge could be caused by brittle steel that has not been tempered enough. I have had this problem with a razor I made from an old file.
Another problem source is dimensions. Test to see what your spine thickness/blade width ratio is. If it is over 4 then that is usually the problem.
The next problem source is type of steel used. D2 is used by some makers but is known as a chippy steel.
The last source is an inadvertent mistake during heat treating. To high of a temp, to long of a soak, to much time before quenching, to long of a time before tempering, etc.
The last is that the grind along the edge is just to thin.

Just my 2 cents