How did you make your 25i footage 50p in the first place?
EDIT: Please post an untouched sample from your source file.
I bobbed the frame rate in Handbrake. Here’s a raw sample of the 25i footage. However, Snell did take the original 25i file and make it 60p without any additional processing on my part.
Here’s an untouched clip: https://drive.google.com/open?id=0B1-W6ByLSZVKR1F2eDREN1Y4YXc