I'm assuming you cleaned and oiled it after you shot it before?
You probably had oil blocking the flash holes in the nipples, or
possibly excess oil in the cylinder chambers. I usually fire
a cap on each nipple before loading to clean the nipples if the
gun has been cleaned and lubed.
You using ox-yoke wonder wads over the powder? Never heard
of a problem with oil killing powder from them.
What are you using for powder?
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