I have this single pole 3 way dimmer switch where I attached all 4 wires in the correct spot for my living room lantern, or so I thought. My lantern successfully worked, however, all the light switches in my kitchen either stopped working or worked not as expected.
For example, the light switch in my kitchen that's on the same wall as my living room light would only turn my kitchen light on and off if my dimmer switch was on.
What am I doing wrong? Am I using the wrong dimmer switch? More photos in the comments.
Make sure all your pigtails inside the gang box are connected securely. I had this issue once and it ended up being a few loose neutral wires in the pigtail.