Domestic stocks today witnessed marginal losses in afternoon trade for third session in row even as global cues were positive. The Sensex at the Bombay Stock Exchange fell 57 points to trade at 36,338 a short while ago. The Nifty at National Stock Exchange also slipped 14 points to trade at 10,875.However, the rupee at the forex market appreciated 36 paise to 70 rupees and 81 paise against the US dollar in afternoon deals.