Background of the issue:
I deleted a registered site, which was a WP-staging clone, and I am trying to understand why the credits on the production site are gone and not transferred back to the available credits.
Symptoms:
After deleting a registered site, all the credits on the production site disappeared and were not transferred back.
Questions:
Why did deleting a registered site cause the credits to disappear?
How can I recover the lost credits on the production site?
I moved those credits back to your WPML.org account, and instead of 37.000, you should now have a total of 125718 credits.
Usually, clicking the "Add/remove credits" blue button should allow you to move the credits to your WPML.org account. I'm not sure what happened here exactly, but please confirm if you see the credits now in your WPML.org account.
I hope that you will find this information helpful.