Why I lost that Hand?

[Edited by SDK1987]. Here I take a look of rules. And it clerly say that flushes and straights are ignored for the low. If you look in chat box you can see that it says that opponent win low with 6,5,4,3,2. Can you explain me why he is winning high (it is obviously) and low (:f_o: ) with straight. I must miss something. Thanks for your help.
GL at tables!