I may know what's going on.
because at the beginning, the data of other nodes did not have Synchronize, so miner.start () dug up the data of their own nodes. Because there is only one node, it is very easy to dig, and you can get a lot of money at once. But with the Synchronize of the node data, you will find that the data of other nodes is different from your own. At this time, Will empty their own data, and then re-Synchronize node (so, when Synchronize is not finished, it is best not to dig, because if you find that your node data is illegal, it will empty and re-Synchronize, and Synchronize will take a long time). After Synchronize is finished, it is not easy to dig. After getting some coins from the address http://faucet.ropsten.be:3001 above, check Ropsten Testnet , and then use the command to check. No, then you need to start miner.start () before Synchronize comes over.
this is my own understanding. If there is anything wrong, please correct it in time. At that time, I will also encounter this problem when I adopt the amendment

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Hello, when I use private chain mining locally, the progress bar has already completed 100%, but the interface does not show the information of successful mining. I checked the account balance and did not have any money. Excuse me, do you know what's going on?