My VU+ Duo 2 always scans in two versions of BT Sport channels, on the same transponder. I only noticed a couple of weeks ago that the second channel, of BT Sport ESPN was opening, whereas the first, I had been trying, didn't open, even though it had the same details.
I still think it's probably your provider, and maybe something to do with your receiver, as some providers don't work as well as others, with different receivers. I got my parents a line, that works perfectly, on their openbox v8s, using closed softcam software, but on my Duo 2 it was always freezing, when I tested a line, for myself.