I've gone through everything I can think of in your admin and I don't see anything causing the password reset page to not use the default 3 col layout... I tested with a clean install of Kirigami and I could not reproduce the issue... the only difference is that you have several 3rd party extensions installed.
I could not connect to your FTP... there's was a few files I wanted to check... it times out after the TLS connection establishes
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I've gone through everything I can think of and I have no good reason as to why the 1-col layout is being loaded on that page. My only advice would be to disable any of your extensions that have anything to do with rendering front-end content... something is overriding Kirigami's global 3-col default layout. I will try and get another set of eyes on it but I can't reproduce the issue with the fresh rocketlauncher either so the culprit is likely one of your extensions unless you can remember modifying any of the Kirigami layout files in any way directly
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