GTS question

[Spartacus]

I'm an old hat at pokemon but relatively new at getting connected online to the GTS.
I have made one trade so far by leaving a pokemon on offer for a Thundrus. Next time I logged in it appeared. However this time I made a direct trade for a Tornadus and swapped another Thundrus that I obtained, both have disappeared( my guy has gone and the other hasn't appeared), Is this normal? Does a GTS trade take time to show up?

Thanks in advance

[Spartacus]

please ignore this now. after 48 hours he just appeared in my game, in a completely empty box. go figure