sometimes i find that if i create a trade to a player (say i pay 5k for c jolteon by mistake instead of 1.5k i need to delete it...)...so when i go to manage trades and chek it doesnt show the trade and so i cant delete it...the player is still offline though...
is it an error ??

Could be something as simple as an error, if your unable to delete the unwanted trade the first time try reloading manage trades to see if it appears

nope it never appears..especially those involving coins ...they never appear so i cant delete them

I don't know how to make the trade appear, but try to at least tell the person not to accept it.

there might be the rare time that all of them have been deleted by the other person, but other than that i have no clue

You misspelled manage :/ and its could be an error, or the person has deleted it :p

Maybe the same, the user has already deleted the trade so u cant see it. but if it really is a glitch, its dangerous. and for u, u should be more careful when placing the trades.