Another user with the same issue of random multiple clicks by Corsair Harpoon. Bought this mouse last year during Black Friday and only now it started to give me this issue.
Just updated iCUE to the latest version but doesn't seem to have it solved.
Icue: 3.34.161
Dongle FW: 1.7.58
Mouse FW: 1.9.85
Looking forward for a solution (either by fixing the FW or by replacing the mouse)