Probably a bias against skin color and accent. Thais have a prejudice against dark skin, even amongst their own ,and for their own English accent which is not the same as someone from India.
I'm just saying if you get the visa a couple months early it's only costing you $6 CD a month since you have to renew it in 12 months for 1,900 THB. And when you renew you have to put up the 800k.