missing explorer treasure search rewards

Since I had such success in the past with missing buildings and decorations every time the landscape changes, or more recently with specialists missing books, here's another one.

All my explorers returned today, with login time a bit past changing gq. 22 out on prolonged, 3 mails in. great job guys.

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Originally Posted by aklbr

Since I had such success in the past with missing buildings and decorations every time the landscape changes, or more recently with specialists missing books, here's another one.

All my explorers returned today, with login time a bit past changing gq. 22 out on prolonged, 3 mails in. great job guys.

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Are you saying that out of your 22 Explorers who were out on prolonged searches, only three came back with a reward? Any more information is greatly appreciated as to help narrow down the issue.