In your Kundali matching we see that the guna milan score is 26.5 out of 36, which is much higher then 18 that is required for marriage. The Grahmaitri score is 1 out of 5. Grahmaitri is important as it is friendship between the rashi lords. The rashi lord of the boy is Saturn and the rashi lord of the girl is Jupiter. Saturn and Jupiter are very different by nature hence there is less grahmaitri score.
Also the girl is mangalik while the boy is not mangalik. You get a complete guna and grah milan done before marriage.