You were right malihu, I did’t realize that when I put the code to add a link in the visual section , in the URL: field; it actually added an extra <a href=
At the end I just put the code in the text editor, and both piece of code worked just fine
<a href="https://www.kangtai.cl/servicios/#prueba" rel="m_PageScroll2id">En KangTai Cía</a>
and
<a href="#prueba" rel="m_PageScroll2id">En KangTai Cía</a>
Thank you malihu!