Foreground-background pair counts for each field obtained for the ZOU cluster (blue) and the WEN cluster (pink). Pair counts are normalised to those obtained between mock foreground and background random catalogues of the same sky regions. A high number of pairs is observed at small angular distances in every region, followed by a steep decline towards a value of 1, as expected in lensing. Regions G12, NGP, and particularly G15 exhibit an additional increase in pairs above 60 arcminutes, which does not fit the current lensing model. Region G09 does not show this anomalous behaviour.