It sounds to me like it's some kind of mix up on VM systems in the background showing programs from older no longer provisoned boxes, the original V6's Arris boxes which .should have been formatted as part of the upgrade to the Horizon software, and where then swapped out for the Humax boxes.
I take it you've rebooted both boxes and your hub. If not give it a try it won't hurt.
I haven't got iOS, only android so may be set out slightly differently, but using the TV GO android app you have to select Edit Recording first and then Delete Recording.
Have you tried uninstalling and then reinstalling the iOS TVGo app?
Can you actually play programs using the TVGO app?
I suggest also checking that the 360 Virgin Box serial numbers on your account are set up correctly ( I wouldn't have thought so but they may be showing the old box serial numbers and thus the systems think it's still got the older box recordings) This hould have been cleared when the techs installed the Humax boxes.
On your TV 360 go to Settings > Info > About and compare the Virgin Box Serial Numbers match with those showing in the TVGO app.
In the TVGO app you will find them under Settings > Diagnostics > CPE 1 ID and CPE 2 ID
You could possibly try a factory reset.
To factory reset go to Settings (the cog at the end of the Home menu) > System > Factory Reset. It's actually misnamed and only a partial system reset and not a complete factory reset. You are given 2 options
With the 360 selecting Choose Keep Recordings means you won't lose your recordings (except hopefully the ghost recordings) or any links you've set up (but will have to sign into apps such as iPlayer, Prime, Netflix and ITV Hub again, and alter a few other settings)
You could try going the whole hog and choose the Format Disk Option, but I would advise making a note of any series links you have set up first, and also watch any recordings you need before they disappear into the ether.
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