Help: rejection for "interlaced footage" or "interlacing"

First of all I must say that curation recently has been very good.
On the very few rejections I am puzzled by the reason given: interlaced footage or interlacing.
Reanalysing the clips I cannot see anything wrong.
Also these clips are taken with the same camera and same post production and encoding as all others.
The only pattern seems to be that it applies only to clips uploaded as HD, non to ones uploaded as 4k.
Can anyone help understand? (I have sent a message to the curator, but no reply)

What camera are you using and what codec are you using?
If your camera is shooting progressive are you doing something to convert it to interlaced?

I use a Panny GH4 at 24 fps progressive and a Phantom 4, same settings.
When encoding to HD I use H.264, quality 90, target 50Mbps

Ahi, ahi.
I just noticed that I have been using: FIELD ORDER: Upper first, instead than Progressive.
Could that be the culprit?
For ASPECT I am using Square pixels (1.0)

Yes, the camera shoots progressive. With that setting as upper you have been converting it to interlaced which they don't accept any longer.

Make sure the settings is for progressive and square pixels.

Thanks a lot, this was very helpful.
I was interlacing both in HD and in 4K

Although I sell clips every week that are Interlaced, P5 has said they do want any more. Sounds like a mistake that sometimes is easy to make not having the right blocks checked when processing.

This might also explain why I was getting loads of moiree with the Phantom 4, although lowering the sharpness to -3 improved things