I’m having a similar issue. I installed a user registration form that uses reCaptcha, and that has eliminated bots from registering, however, if one accesses the bbPress discussion board without first logging in, they are presented with the bbPress login, and when they enter their credentials it takes them to a second login using reCaptcha and loses their credentials they have just typed in. It’s both confusing and annoying.
I used the instructions here to add ‘wp-content/themes/%your-theme-name%/bbpress/form-user-login.php’ However Filezilla throws an error, and I assume this is because my theme is locked down.
Can I get instruction to solve this by adding a child theme? (if that is the issue).