Hey, @uuliao from the tx you have submitted, following is a list of staking operations (that successfully executed on chain) you submitted for the operator 3:
#2340178, nominate 9,336 tAI3
#2346326, nominate 24,000 tAI3
#2346344, nominate 4,956 tAI3
#2358269, nominate 92,285 tAI3
#2370796, nominate 1,609 tAI3
#2408283, nominate 13,849 tAI3
In total: 146,035 tAI3
#2517422, withdraw all
#2539751, unlock
Received 146,087 tAI3
In summary, it seems you have nominated ~146,035 tAI3 (instead of 190,000 tAI3) for 10-16 days and received ~146,087 tAI3, thus there is ~52 tAI3 reward.
Please let me know if there is anything missed/wrong, thanks!