Two way dimmers are tricky, specially if they are lighted switches. Which end of the two way circuit did you put the switch? Is it on the main switch or the remote switch. Remember, there is a lower power current always available in the switch box to keep the switch lighted when it's in the off position. Are you tapped into that by mistake?
Two way dimmers are tricky. You didn't put a dimmer on both ends did you?
JLK
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