The stats in adwords aren't up to the minute, so they can show varying results. 5 could be the average position, occasionally if your ad's shown in position 1 or 2, it will bring the average position up.
The stats aren't great though, and refreshing the page a couple of times gives you a better indication of where your ad's appearing.
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oh thank god I thought it was something serious ! ... it seems that by dumping you down the page half the time they think you are suddenly going to write better ads than the ones that were running just fine with an excellent CTR
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