Can't Login to WordPress – Weird Situation

WP Friends,

I’m running the site https://www.childrenwithcancer.org. The admin URL is https://www.childrenwithcancer.org/wp/wp-admin.

When I try to login to https://www.childrenwithcancer.org/wp/wp-admin I do not get an error about incorrect password. Instead, the screen just refreshes and thus an infinate loop is created where i can’t login. While it’s refreshing it looks like it going to a redirect site then back. But I’m not sure.

The strange thing is it randomly works – it makes no sense. I’ve tried different PCs, Browsers, cleared cache, etc.. and of course I’m typing the password correctly, not using caps lock or anything.

The extra folder is because we have an old version of the site that we haven’t deleted. The new site is in a folder called “wp” as you can see.

Everything was working fine until recently – so I don’t understand how the old site could be all the sudden causing an issue (assuming that’s the issue).

Can anyone help??

BTW – I’m pretty sure I have 3.6.1 but it might be 3.6 if that matters.

Thanks,
Tim