If you select an "other language" in mobile version, it links to the desktop version of Wikipedia, and not to mobile version.
E.g. in https://de.m.wikipedia.org/wiki/Albaic%C3%ADn you get to https://en.wikipedia.org/wiki/Albaic%C3%ADn instead of https://en.m.wikipedia.org/wiki/Albaic%C3%ADn - see screenshots attached.
The behavior can be reproduced under various browsers.