Hi all, I have taken a double light switch off (to remove some cladding it was mounted on) and one wire was not connected to anything. It may have popped out of the connection when I removed the cover. I have put it back into the connection I thought likely but now when one of the switches is acting like a master switch for the other side.
There are 2 main wires into the switch. One has a bare copper, red and black. The other just has a red and it is this red one which was unconnected. The switch has 6 connection options with a wire link from the bottom left to the top right.
Looked at your images. The twin cable ( red and black ) COULD be a feed ( red ) and switch wire black. Turn off power at mains First ( SAFE ISOLATION ) and put red of twin in postion where you currently have single red. The single red is probaly a switch wire . A grey cable ( link ) looks to be taking a feed from the red ( twin cable ) to the black wire ( another switch wire ) . the single red could be tried in L1 opposite the common of the other red. The earth ( BARE copper wire ) should be sleeved with earth sleeveing ( green and yellow ) and the single red should have an earth in the cable and should be sleeved green and yellow and connected with the other earth. You could get a local registered electrician to check your connections.
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