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I can think of two reasons this can happen.
1. - The snippet showing in the results where your ranking for #2 is more attractive to the user so they click it more frequently. (Or the snippet for the #1 spot is less attractive).
2. - You can be #25 on a very popular search term and get more clicks than #1 on an less popular (obscure) search term.
At the moment, if I click through, it always goes to google.com...hl=en_GB , often you cannot find your own url in English results with foreign language content.