do you want to improve it ?
What captcha on bittrex ? I'am using 2FA on this exchanger, and never was asked to enter any captcha instead.
LOL, even i am using 2FA and still asks for Captcha for the first login and after that you need to enter 2FA pin. I had also similar problem long time back, i just clear all cache and then everything worked fine. Hope it helps OP.