I have spoken to Lara M at Quickbooks support since posting this. However, the issue remains and Lara is attempting to resolve the issue via a senior member of staff. It almost appears that there is a cache issue with my data at Quickbooks' end. Have you encountered this before?
Thanks for getting back to me - this isn't something which I've come across before and does sound like it could potentially be caused by a cache issue if these additional pay types had previously been set up on the account, and are for some reason being pulled through. If you haven't already, it would be a good idea to clear the cache on the browser you're using and then close/reopen this before running the payroll.
Please get back to us below to know the outcome or if you're requiring further assistance with this! :)
Yes, tried clearing cache, deleting history etc before making contact with QB Support. Spent over an hour trying different things with support but all to no avail, unfortunately. As I said previously, just waiting for them to come back to me with a solution (hopefully!).