double reward from Explorer

Hello, I was rewarded 2 times when my explorer finished searching for the treasure. When I received a notification about finished searching, I went to the mail to accept the reward. I clicked on it, between this someone accept my trade offer and new mail occurred there. So I clicked to confirm also trade offer. Then I closed a mail, but nothing happened so I went to the mail again and both mails were there again. So I confirmed them again and few seconds later I got 2 times reward from my explorer (in the 'Start menu'). I am not sure what was with my trade - I registered only one acceptance.

Update: the second reward was just hanging in my Start menu when I wanted to add it to the Mayor's house (grayed icons). After logging out and logging in they disappeared.

Hiyas same is possible after a battle... more then 2x even... I did it 6 times in a row... Think it was because it was laggy...