uCare login with existed user

Hello,

We are using the version 1.7.1
I have a consecutive issue with log in with existed user:

1. Step: typing my email address
2. Step: typing my password
And at this step nothing happening, no error message, no any visible change on the site
I’ve tried with support admin user
And with support user as well and none of them working

Could help me, what the reason can be?

Thank you very much, in advance!

The page I need help with: [log in to see the link]