There's an incorrect balance on my account, and I can't complete the migration process.

The website https://explorer.horizen displays incorrect information about the amount of zen in the wallet, which is three times less than it actually is. Because of this, I cannot complete the migration process to avoid losing my coins. Please help

Have you gone through the Start Here - Prerequisites | Horizen Documentation claim tutorials ? As far as I know the explorer is working as it should. If you continue to have issues join #discord Horizen and create a support ticket