Problems with password protecting a page and Chrome and Safari not recognizing

I am need to require a password for a specific page or pages of my site.

However when someone tries to enter my password, it doesn't work, in Chrome, Safari or Edge. However it works in FireFox. I've tried having friends test it from various computers and get the same response.

I've disabled LastPass, and I've also disabled Chrome, Safari and Edge auto-fill password save feature. I also deleted all my saved passwords. I tried it in chrome's Incognito Mode. I am having the same problem consistently.

Does anyone have a solution or have gone through something simular?

I have the same problem.

Delete your browsing history including cookies, not your password manager, but you can check to see what password if any Chrome has stored for that page. 

go to Chrome settings and search for passwords or you can go to Google Password Manager and sign in with the same Chrome account. 

 https://passwords.google.com/intro