From what we can see on our end, it’s a missing parameter called ‘picture structure’. In regular 1080i broadcasts the parameter called ‘field’ is always present for the ‘picture structure’ parameter.
In both cases this parameter was missing.
Since the the tools/interface we use is not the same as what the broadcasters use on their end, it’s not clear exactly what checkbox/switch isn’t quite right.
But to be fair to them, their video monitoring equipment does not transcode, so they’d never know that this is happening unless someone (like us or another customer using transcoding hardware) notifies them.