Cannot login on minecraft.net

I'm sure I keyed in the correct password, but the site still said "Invalid e-mail address or password", shown in the red bar in the screenshot. Different from WEB-1039, I didn't change my password before.

Also, I'm a mainland Chinese player and I was using VPN to get Google's reCAPTCHA (detailed reason see WEB-1035). Is that the reason of this (I don't think so because I was able to access to minecraft.net normally by using VPN)?