This may have been an error with the automated system, but if you have uploaded your hi-res version once all will be fine.
Alternatively, if you entered your image into more than one category, it could have potentially been shortlisted twice which would be why you would receive the message twice. Amy
I think there must have been a problem with the system as I got a request for a higher res pic the other day and complied with it. Found to my amazement and utter delight yesterday that I had been shortlisted in the landscape section but then got another request for a high res version last night. I have checked the link and it is showing as a high resolution version supplied so assume that the judges were seeing it Ok to shortlist me. If that is an erroneous assumpotiuon on my part please advise me Amy as I have ignored the second request as a system error at this point. And thanks ever so much judges for shortlisting me - even if I get no further it has made my day!