Jilly
If you set the project preset manually to 1920 x 1080 @ 50 progressive frames per second, in Change Settings you should have selected
PAL
AVCHD
AVCHD 1080p50
If you did, then you would have gotten Edit Menu/Project Settings/General to look like the screenshot I posted in post 7 in this thread.
The screenshot that you posted in post 10 tells me that the project preset was set as the PAL default for the program
PAL
AVCHD
AVCHD HD1080i25.
Please review the details and consider. Please let me know where we need more clarification.
Thank you.
ATR