Link does not work correctly

In the browser, when I'm in "http://127.0.0.1:8000/" and click in register it takes me to "http://127.0.0.1:8000/register" and it works correctly, but if I'm in "http: //127.0.0.1:8000/about/ "and click on register takes me to" http://127.0.0.1:8000/about/register/ "instead of" http://127.0.0.1:8000/register " . My project : https://github.com/barkalez/recetas

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