I'm quite new to openWRT, I just reseted my router to start fresh, entered a new password, and now I can't login on a normal browser tab, no "wrong password" prompt or anything it just goes back to the password prompt but on a Private browsing tab it works just fine..works ok with SSH as well... I tried reseting my router twice already and still have the same issue ...
I'm running a YouHua WR1200JS (also known as MTK MT7621A with a fresh install of the 19.07 firmware ...
I assume you had luci-ssl installed before, this sets up a redirect from http to https - and browser tend to remember those far longer than it makes sense. Explicitly deleting your browser cache should help with that (or re-installing luci-ssl).
I recently found out that deleting the "sysauth" cookie helped too, at least in Firefox. Apparently the cached "https" cookie prevents setting a lower security "http" cookie.
Do you have by any chance a good tutorial on how to enable HTTPS with a let's encrypt certificate on a local domain (ie. I don't publicly own the domain I'm using locally on my network ...)