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Surely too much water. I use that soap sometimes and it usually makes a very good, creamy and stable lather.

Lovely razor in very good shape!
If you don't mind making a comment on your lather, by seeing the size of bubbles and how the lather is moving down on the bowl, it seems you are using too much water...

Welcome abroad an enjoy the best way for shaving. What kind of straight razor do you have?