FWIW, in short: it instructs the kernel to relax the USB protocol for devices that do not implement the USB HID spec by the letter, either because of poorly engineered/implemented firmware or the vendor did not foresee/test a specific setup (in this case connecting four devices of the same kind).
The hexadecimal numbers relate to <vendorid>:<deviceid>:<applicable quirk> (Links to kernel source code tree).
@d3r3kdrumm0nd please mark your initial post title with [solved] as a courtesy for other users who might face the same issue.