Multi state W2s with large W2Gs

So my residence is in NJ. I have W2s from both nj and ny. I have 1.2 million in w2gs from nj. Total gambled I have 20 million wagered and 140k in net profit +
30k in w2s. Now on my ny w2, I have 70000 in taxable income. I paid 11k in federal and 3.5 in state on that. He’s trying to tell me I owe another 5k on my New York State taxes. Mt accountant said New York add up my entire taxable income from all of my w2s and then divide it by .02. Information he says on the IT-203. It doesn’t make sense to me and it sounds like I’m getting taxed twice. Any advice?