Changes to the shipping configuration that impact your recurring shipping rates setting (dynamic or retain), advanced settings (errors and product type), and the charge shipping on recurring orders setting on your account require all existing charges to be resynced to adapt to that change. The warning popup ensures that you are aware that your charges will be updated by proceeding with the change.

Resyncing orders to update the shipping rate setting may also bring in tax updates and other changes made to the customer's profile or products.

It is recommended to download the Charges - Queued export to verify the shipping rate on file for each order after making this type of change.