Before re-syncing your sources it is a good idea to lock your current transactions so that there is no risk of them being altered when you re-sync, especially if you have made manual edits to any of your transactions.
To lock transactions in before a certain date please follow these steps:
Click on the person icon in the upper right corner.
In the left side-bar select Other.
Scroll to the bottom and see ‘Lock Transactions Before’.
Select the date you would like to lock transactions before and then click ‘Save’.
Upon locking your transactions, you can then proceed to re-sync your sources.