swapping a light switch, what am I doing wrong?

[Tog-]

I am trying to swap an old gold metal light switch out, thinking it was going to be straight forward, however when I fit the new switch, it trips the circuit. Can you see an obvious error here?

Old gold switch has COM, L1 and L2 at the top and bottom of the switch, new switch has them clearly separated for each switch. when putting the new switch on I put all three wires from the top into one side of the switch and the all the wires from the bottom into the other side of the switch, matching up which wire was originally in COM, L1 and L2, but this hasn't worked.

Returning the wires to the old switch in the original orientation allows the switch and circuit to function normally.

 

[CountryFan]

You're not mistakenly putting the CPC/earth into a switched live are you?

 

[Tog-]

Thank you for replying.

The green wire visible in the picture of the wiring is connected to the earthing point on the back box and I am connecting it to the gold earth point on the new switch.

 

[foxhole]

Old switch had them side by side same as new switch , that’s your error .

 

[Tog-]

Foxhole, thank you very much, this didn't even remotely occur to me as a possibility, I will report back.

 

[CountryFan]

Old switch had them side by side same as new switch , that’s your error .

I nearly suggested that, but misinterpreted what was written

 

[Tog-]

Thank you both for taking time out of your day to help out, I can confirm that was the error.

 

[ebee]

If you take as in the pic ending 8788 and take one of those switches and put in back in place upside down then you would have the equivalent of the pic ending 8789.
hope that helps