Sounds like the mob was probably casting on you, or you didn't turn off auto attack.
If the mob starts to cast before you FD and the mobs casting isn't interupted, any spell will break your FD, even if resisted.
If you FD with auto attack on, your FD will automatically break itself with no message. Some monks set up a macro that turns auto attack off before FDing, which has its pros and cons.
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