When confronted by such things, I can think of a ton of work around attempts to try to straighten it out, and sometimes I just revert back to taking things down and rebuilding rather than playing in frustration for hours. There may be some simple toggle fix here or a router reboot may be all that is needed, but from a distance it is difficult to tell without a ton of back and forth posts.
First, I would insure that I have "Allow all new devices to connect" (on the page you did not want to be redirected) checked then saved. . You may have already done this but it was not stated.
Then I would make sure the computer was not connected to the wifi. Power it off. I would go to the section on Allowed But Not Currently Connected, and remove the computer from the list. This is just clean up.
You may want to do a router reboot here.
On the computer I would then forget the network. Then I would try to reestablish connection, with password.
