Light Switch Issues (electrical or bad light switch?)?

In my den area there is a two light switch together (same plate). The one turns on the hallway light and the other turns on the den lights. If you turn on the hallway light using the den light switch it causes the other light switch that controls the hallway light (near the door) to not work). What would be the... show more In my den area there is a two light switch together (same plate). The one turns on the hallway light and the other turns on the den lights. If you turn on the hallway light using the den light switch it causes the other light switch that controls the hallway light (near the door) to not work). What would be the cause of this and how would I fix it?
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