Hello,
This has been fixed in version 8.9.0 already and what you describe I can no longer reproduce since it has been fixed. However I am also sure that what you are experiencing is real

So I decided to run some tests on a few other sites and then I did find it.
The reason it fails is when the ordering value goes to a negative number, like ordering is set to -1, 0, 1. The -1 is not accepted by the database as it requires a positive number.
Now to allow for both positive and negative numbers I have made some changes. Please follow these steps:
- Load the attached patch file
- Go to RO CSVI -> About page
- Click on Verify Database
- Now try the drag and drop ordering
That should solve the issue you are seeing. Let me know how it goes.
Kind regards,
RolandD
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