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Surf detection problems

Hi all, im making a photoapp for recognize images from photographers. Today i receive an image but in the matched file i get this:

image description

The red line is the recognized area... i dont have any problem with other images only with high contrast or so but i dont know why i get this problem... Im using surf algorithm for detect and good features by lowe's. My values are 0,45 for good features, 20 for minHessian and 8.0 for ransac homography. Anybody can explain to me why i get fault recognition? Im using python