Hi,
I have had problems with leaking brake fluid in a drum brake and disc brake situation (not at the same time....phew) and I don't believe the fluid could affect the pads adhesion to the backing.
I did have to rough up the pads once I got them clean of brake fluid however as brake pads covered in brake fluid are not that effective.
I believe your first thoughts of dodgy manufacture is probably the most likely explanation in this case.
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