In the ashtkoot guna milan we see that your score is 27 out of 36, which is much higher than 18 that is required for marriage. The issue is Grahamaitri where the score is 0.5 out of 5. Grahmaitri in simple terms means friendship between the two Rashi lords. As the is born under the sign Aries and the boy is born under the sign Capricorn their lords are Mars and Saturn which are inimical. Therefore despite the good Guna milan there would be strong differences of opinion, not only to the level of arguments, but beyong when natives make it a personal ego issue. The strong ego clashes are likely under such bad grahmaitri score. Saturn and Mars are known to be conflicting planets, therefore conflicts will be there in this relationship.