Backorder processing: Error in WMENG quantity

Hello Experts,

Please, I really need a help to solve this problem.

I have a problem with BOP execution in some orders, the order below was requested 5 and we have 3 in stock, and should remain 2:

Image may be NSFW.
Clik here to view.

and when you look in ECC, at TCODE VA03, the quantity remain is 26.660,:

Image may be NSFW.
Clik here to view.

anybody has an idea what's the problem?

I and abap consultant debug the BOP transaction and we look that quantity  already wrong in APO side:

Image may be NSFW.
Clik here to view.

Thanks in advance,

Alexandre Landi