Problems with patches on pants

Burning Crusade/Outland

good day. recently there was a problem with use of patches for pants on 50lvl twinks
at 50 lvl twink have http://ru.wowhead.com/item=29964 (spent a lot of time and gold on them) and i CANT use
http://www.wowhead.com/item=29534/clefthide-leg-armor and http://www.wowhead.com/item=29536/nethercleft-leg-armor on pants

soulbond pants are in my bag, i put them in trade for my 70 and he cant use this ****

patch for 30 stamina always used for twinks 19 lvl ++ all time, on all possible servers
patch for 40 stamina (as iremember from 2006-8 y.) used by 35 ++ lvl items
all top enchants (mangose, crusader, 20agi, 40spd) we all time use at 35 ++ lvl items and shoulders enchant from naxaramas wе can also use it even on 19++ lvl

on wowhead and wiki all time write : You can still use the armor for a low level character, you attach this to another player's soulbound leg armor via the "Do not trade" box in the Trade window, and 60 lvl player can use the patch on your pants

Please explain to me please whoever.... why I CANT USE a patch on these fkng pants