Query re VS400 seating

Myself and my partner are flying out to Dubai for a weeks hols next June (long way off - I know)[:(]
Anyway, we have booked through Virgin Holidays and for some reason, now they have changed their booking system (for Worldwide hols) even though I have a 6 digit locator code I can't log onto the VS website and 'manage my booking'. They are aware of the problem (VH that is) and are trying to sort it out.
Anyway, I wanted to prebook my seats and VH said they would sort that out for me. Excellent, and I was given 37 A & C (lowly economy I'm afraid).
I have logged in with expertflyer and sure enough those 2 seats are blocked off in and outbound. It looks like we are the first set of seats in economy as there are no other seats in front of us (according to expertflyer) BUT when I check on here which aircraft I will be on (96% A340-600 Config 1 or 4% A340-300 Config 1 (Suite)) both planes show economy seats start at row at either 41 or 32 (depending on the layout).
So how come on expert flyer we are showing as row 37 being first. As I can't log onto VA and choose my own seat, I have no idea what else is available etc.
Can anyone explain this to me please.
Anyway, we have booked through Virgin Holidays and for some reason, now they have changed their booking system (for Worldwide hols) even though I have a 6 digit locator code I can't log onto the VS website and 'manage my booking'. They are aware of the problem (VH that is) and are trying to sort it out.
Anyway, I wanted to prebook my seats and VH said they would sort that out for me. Excellent, and I was given 37 A & C (lowly economy I'm afraid).
I have logged in with expertflyer and sure enough those 2 seats are blocked off in and outbound. It looks like we are the first set of seats in economy as there are no other seats in front of us (according to expertflyer) BUT when I check on here which aircraft I will be on (96% A340-600 Config 1 or 4% A340-300 Config 1 (Suite)) both planes show economy seats start at row at either 41 or 32 (depending on the layout).
So how come on expert flyer we are showing as row 37 being first. As I can't log onto VA and choose my own seat, I have no idea what else is available etc.
Can anyone explain this to me please.