Skus on some products being rewritten sequentially

Hello,

I am hoping someone can lead me in the right direction because I’m having a hard time reproducing an issue that is occurring to some products randomly every few days.

Issue description:

Some products are having their SKUs rewritten in sequential order.

For example:

I may have 20 variants on a product in different colors/sizes.

Original sku values

100700800 Product 1 Black

100700825 Product 1 Orange

100700850 Product 1 Lavender

Suddenly, I am receiving orders with skus such as 100700801

Now, when I view my product some skus have been rewritten.

NEW incorrect sku values

100700800 Product 1 Black

100700801 Product 1 Orange

100700802 Product 1 Lavender

I run a script to update inventory quantities from a central db every few hours that calls a POST to /admin/api/2021-04/inventory_levels/set.json

which may be the culprit, but when I run it manually I am not seeing anything ususual-- it basically runs as it always did.

Has anyone else experienced their SKUs being rewritten in this way?