Board Game Arena

In a recently completed game, i chose Mongolia and on my turn I chose the Conquest action. I had the highest military strength so I received the 2 victory point and the other 3 players lost a meeple. As conquest was a red dot, I believed I too would lose a meeple, but I did not.
On the next round I chose Conquest again with the same results, ending my turn with the 3 meeples i stated with. On the third and final round that Conquest was an option, I still had the highest military so I chose it a again. This time it worked as expected. The other players lost a meeple and I ended my turn with only 2 as expected. Why?

You should probably report this in the bug report section and link to the game

You get a new meeple for annexing a new civ (probably the root cause confusion) and lost/sacrificed a meeple as expected.
It is a case of lacking logs.