Hi xitizsharma,
First off, both of these Scores are outstanding - so you can comfortably apply to any Schools that interest you. As such, another retest is probably not necessary. Depending on the Schools that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/In answer to your immediate question, one Scaled Score 'point' is not a standard unit of scoring, so while increasing your Scaled Scores generally leads to a higher overall Score, that does not always happen. This is ultimately due to 'rounding' in the Scoring Algorithm. While I understand your interest in why your Scores came out the way that they did, as an individual Test Taker you do not have any control over that scoring process. The more relevant questions are ultimately about your application plans.
1) When are you planning to apply to Business School?
2) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich