Jenny, I'm with Ryzen on this one. That switch is a metal one. I guess the one you took off is plastic?
A metal switch MUST be earthed to be safe (in the event of a fault.)
3-gang switch with (possibly) some 2-way switching. Easy enough for an electrician to identify each wire. You have it "sort of " working, I know, but it needs to be right.
I'm afraid it would be far too complicated to identify the wires without being there. You really must get someone in, if only to earth the switch for you.
AB doesn't like losing its posters............. and nor do we ;o(