With current try.gitea.io, I proceed as follows:

• Create a new gitea account linked to an existing github account
• Sign in using the github account
• Go to gitea settings, click on "forgot password?" and confirm the sending of a reset email
• While staying signed-in to gitea, copy-and-paste the reset URL into the browser, visit it

The result of the above is that there's a redirect to https://try.gitea.io/. No password reset form is presented.

If I log out from gitea before visiting the password reset URL, I am able to reset the password.

I verified the above behavior with two browsers: Firefox ESR 52.9.0 and Chromium 68.0.3440.75.