I hope someone could help

I have a product that has been stranded for more than 48 hours now, and Amazon wasn’t giving me a reason for it.

I have also 1 high-jacker that uses my listing so I’m afraid I’m losing profit out of this issue. Upon checking, I’ve seen that out of 73 stranded units there are 10 reserved items under it.

Could anyone explain to me what are these reserved units?

TIA

Amazon is holding the units for something - customer orders, checking the stuff, processing it for some reason, etc.