Log-In Error – Have to log in twice

I am new to WordPress and my site (https://www.appletechtalk.com) has only been up for about a week or so.

My problem is that every time I try to log in to the Admin panel, I enter the User Name and Password, and the screen returns to the Log-In screen with a message:

ERROR: Incorrect User Name or Password

I enter the same credentials a second time and then they are accepted.
I know the first entry is correct as I have the ID and Password saved in my system key-chain and it prefills. I have also entered them manually and confirmed that they are entered correctly.

I set up a test user with a different ID and password and that ID does not seem to have the same problem.

I would appreciate any suggestions on how to resolve this issue.

Thank you.

David