Duplicate future payment amounts

If you haven't done so already, I'd try the following actions:

• Download and install the latest Mondo Patch file from https://www.quicken.com/support/update-and-mondo-patch-20182019-release-quicken-windows-subscription-product to ensure your Quicken software is up to date and correctly installed.
• Reboot Windows.
• Validate and Supervalidate your Quicken data file.
• If nothing helps, try to restore your Quicken data file from an Automatic or Manual backup taken just prior to the problems first occurring.

Validate and Supervalidate instructions

First save a backup file prior to performing these steps

Validate: 

• File
• Validate and Repair File...
• Validate File
• Click OK
• Close the Data Log
• Close Quicken (leave it closed for at least 30 secs)
• Reopen Quicken and see if the issue persists.

Super Validate:

• File
• Hold CTRL + Shift and click Validate and Repair File...
• Supervalidate File
• Click OK
• Close the Data Log
• Close Quicken (leave it closed for at least 30 secs)
• Reopen Quicken and see if the issue persists.