data error in ml-1m.test.negatives?

[hasqdwuduw]

(12,844) 3427 2660 3013 3595 115 2742 1108 511 3068 1034 3653 1699 507 1962 2959 1126 1514 932 844 3179 1239 1731 373 1343 3383 1433 1831 2010 302 1283 2676 2168 2170 3332 2138 396 2757 2956 3247 3014 1516 2909 1693 3285 3119 3448 1662 2379 2553 3023 1180 2277 1083 3702 2133 1735 1018 1488 1792 1 747 1941 2326 2345 1748 1824 3667 2275 1479 2837 3136 2748 1402 208 3564 1296 2952 538 737 3130 543 2226 2011 1903 2571 2770 2056 713 912 2118 1918 3112 2515 257 1230 2253 2452 1492 2058

In my opinion, the movie_id in the tuple is the positive instance while the followings are negative instances. But 844 appears twice in this piece of data?