The main problem is synchronous data from grin node.
I have another node in Russia, It may help.
nodeAddress: http://162.62.15.164:3413
key:gty7TMk3acBRKnLysawW
Click navigationbar right barItem -> config full node-> add . After Completion， select the new node to refresh.

This transfer has been confirmed by grin chain. The reason the wallet doesn't show confirmation is that it doesn't pull up to date data on the chain.
You can do this:
1、Click navigationbar right barItem -> check. Pull the latest status.
2、If you have another fullnode . Click navigationbar right barItem -> config full node-> add you full node and refresh.
3. Reimport the mnemonic(It will pull the latest status from the chain ).