I've noticed this today twice.
When i went to shop, i only have around 49.3k of Metal Fragments.
As anyone knows, we can sell 20k Metal Frags for 200 cash.
This time, I've sold twice (40k) and I've lost my 9.3k... Attached you have the print from sell.
The same occurred this morning when I've sold Low Grade Fuel, I've lost like 500 Low Grade Fuel when i sold like 30k-40k of it.