getting 2 of whatever I render

Had lots of probs in the past but when I updated to 8 they all disappeared, lots of people (trying to be helpful of course) said it’s my system…it wasn’t it was Cubase…so sailing along great with CP8…love the RIP, so I thought maybe 8’s ok and updated to 8.2 and I immediately have a problem with RIP, I’m suddenly getting 2 of whatever I render, one of them says it’s from my N8 LR output but my render set up doesn’t ask for it, it’s set to ‘‘complete signal path’’ which doesn’t include the master out (as far as I’m aware) if it does then it means it wasn’t working in the last version…

so can anyone tell me why I’m getting 2 tracks please,
I’m absolutely ready to be told I’m a nonce and am doing something wrong but this was not happening before I updated and considering that the probs I was having evaporated when I upped to 8 my first thought is that it’s summat to do with CP8.2

my thanks in advance to any helpful person…

best, Kevin