Based on what you've posted, I'm confused as to the nature of the marking scheme.
Two consecutive debits appear, putting the balance at what I would consider a negative 5000.

Use SSIS, and have separate items for each table, so that you can control each one individually, and set each one to NOT fail the package on errors.   You may...

To do that last, you need to be sure that the custom range selection is higher in the list of parameters than any other one, so that it will be...

You might also want to check your MAX RAM configuration for SQL Server, and be sure you didn't use all RAM on the box, because otherwise the operating system won't...

Do you seriously expect us to look at nothing and magically see where your problem is?   Seriously?

This is a duplicate post.   See the other one here:  https://www.sqlservercentral.com/Forums/2024009/Difference-in-checksum-calculations

Send me a private message with a quick outline of what you have in mind.  I've been doing ETL for a rather long time, as well as a crap ton...