The station, entrances, and stops are tagged correctly in OSM as Muni-only; BART does not appear on any tag either in text or by Wikidata code. This should be taken up with Organic Maps. There's nothing in OSM that would support it showing a BART logo, and there's nothing we can do to fix it.

Entrances: https://www.openstreetmap.org/node/389458156 and 389459531, 389458599, 389458102
Stop positions: https://www.openstreetmap.org/node/297863037 and 6315233964, 5323877774, 5323877773, 6315233965
Station: https://www.openstreetmap.org/way/772273796 and 551273359
Station area: https://www.openstreetmap.org/relation/1069505