did you spawn in your home area or the lobby, and what was mentioned after the duel, did you win tie or lose? This is not enough information.
A poison tick might seem like you die at the same time, but it could have been half a second later or earlier.

No it was draw i saw it, but only i lost my AGS, he didnt lost anything.

According to the logs you simply lost the stake:

[2016-07-13 08:43:46]: From koomahiiri to jouda12: Armadyl godsword[11694], 1

[2016-07-13 08:43:46]: From koomahiiri to jouda12: Armadyl godsword[11694], 1


unless you have proof that it was indeed a tie, I cannot verify your story and the bug report will be closed.