How do I apply Sift for multiple images

Attached you can see my edition to the original match code implementing sift and appendimages for 2 images. However the line matching only works for the second image and sifting of the first image fails. I simply copy pasted the code for the first image and changed variable to apply for second image. However when sifting the lines to match features of object 1 to scene fails, whereas object 2 to scene works. What I need help with is whether the issue is in the matching of the descriptor, or append imaging messing with the location of the matches.

Thanks.