Oops! Apologies I inserted the wrong link, the one I'm using has only one relay:

https://www.amazon.co.uk/Fasizi-Brea...dp/B09Z29TYNL/

I don't use the relay anyway.

I see what you mean about the pin confusion The back of the board is more likely to be correct since it shows the PCB legend. Someone has got confused labelling the photo of the front.

If you intend to use the relays not that I don't think they are rated for UK mains voltage - I did need a relay function so use a separate solid-state relay instead.