Two paintings with a combined value of nearly $10 million will hit the auction block Monday amid questions of whether they were looted by the Nazis from Jewish owners during the Third Reich, The Post has learned. Egon Schiele’s “Self Portrait (1910)” and “Standing Girl in White Petticoat (1911)” have gaps in their history of ownership during the Nazi period, between 1933 and 1945, experts say. The paintings are scheduled to be auctioned by Sotheby’s as part of the house’s “Modern Evening Auction” sale on Nov. 14. One of the paintings, “Self Portrait,” a water color showing Schiele in a...