Could someone answer my question?
 

well i just started playing d2 a little while age...about 6 months to be exact…any during this new ladder season i did some mfing and did a lot of trading and managed to get 6 ists...now i traded all my ists away to get a jah so i could hopefully in a little while find a ber and make an enigma...so i had this rune in my stash for about a week and then when i went to my stash to put something in there it was gone...i just wanted to know how it happened...i mean i know it was duped but how do the disappear.. i would greatly appreciate any responses.

many high runes are dupes, if u dont want them to dissapear, perm them(i dont know how, should ask sum1 that knows) of u shouldve put it ina your 3 sock armor if u had.

should ask sum1 that knows more than me, im a nub to perming itamz. i got sum dupes of a friend in start of .09, and u dudnt touch em and they didnt dissapear until i started using em on my char on .10

masterty like rebel said alot of the runes are duped the best way to try and keep them is put them on a char/account that never really gets used till you are going to use them as a runeword or such.