[Undelegate] After undelegate, voting power is updated in less than 1 epoch

[NellYao]

Summary of Bug:

After Undelegate, voting power is updated in less than 1 epoch

Version: Exocore 1.0.9

Environment: Four validators built locally, without Oracle
Precondition:

• Perform operations such as deposit, delegation, and undelegate on the node with a voting power of 2700 and query the changes in voting power
• Set epoch as minute

Steps to Reproduce:

1.Deposit 1000 ETH
./assetcli deposit --rpcUrl http://localhost:9545/ --staker 0x622869A3a10261019f88B64D312d0B8a77855390 --amount 1000000000000000000000 --privateKey 3EB1BDCCBACC8D5672918009F3F546EDC09E81BC0B58514C907D1C8C7E149352 --defaultAssetID 0x83E6850591425e3C1E263c054f4466838B9Bd9e4 --layerZeroID 40161

2.Delegate 1000 ETH:
./assetcli delegate --rpcUrl http://localhost:9545/ --staker 0x622869A3a10261019f88B64D312d0B8a77855390 --amount 1000000000000000000000 --privateKey 3EB1BDCCBACC8D5672918009F3F546EDC09E81BC0B58514C907D1C8C7E149352 --defaultAssetID 0x83E6850591425e3C1E263c054f4466838B9Bd9e4 --layerZeroID 40161 --operator exo192mgay9r8mdgwcprcvgdm47td36n974h9r8z6q

3.Selfdelegate:
./assetcli self-delegate --rpcUrl http://localhost:9545/ --staker 0x622869A3a10261019f88B64D312d0B8a77855390 --operator exo192mgay9r8mdgwcprcvgdm47td36n974h9r8z6q --privateKey 3EB1BDCCBACC8D5672918009F3F546EDC09E81BC0B58514C907D1C8C7E149352 --defaultAssetID 0x83E6850591425e3C1E263c054f4466838B9Bd9e4 --layerZeroID 40161

4.Query voting power:
exocored q tendermint-validator-set --node http://localhost:20000/
result: the voting power of address: exovalcons1gzcn6md2xwregl9qjkxjtrfpg0f57g5y3xqmxt is 3700

5.Undeletega 550 ETH:
./assetcli undelegate --rpcUrl http://localhost:9545/ --staker 0x622869A3a10261019f88B64D312d0B8a77855390 --amount 550000000000000000000 --privateKey 3EB1BDCCBACC8D5672918009F3F546EDC09E81BC0B58514C907D1C8C7E149352 --defaultAssetID 0x83E6850591425e3C1E263c054f4466838B9Bd9e4 --layerZeroID 40161 --operator exo192mgay9r8mdgwcprcvgdm47td36n974h9r8z6q

6.Check voting power after 23 seconds:
exocored q tendermint-validator-set --node http://localhost:20000/

Actual result: the voting power of address: exovalcons1gzcn6md2xwregl9qjkxjtrfpg0f57g5y3xqmxt changed from 3700 to 3150

Expected result: After undelegate, the voting power should be updated after 1 epoch

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