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The wiring in the switch box isn't only for the switches. It is also carrying supply power onward to other points of use. That is the reason for the extra wires coming off COM. This would be easier to understand if the 3 brown wires you drew terminated in a block just like the neutrals, and then 2 pigtails from the block went on to feed the two switches ...


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Thanks for the tips. I had removed all the wires, taken pictures and was going to test the configuration again to double check that everything was correct. I was emptying the timer box and noticed a black wire there. I thought it was odd to see a wire there.. I re-read the instructions and it turns out I missed a step! As you can see below, there is a step "...


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