Money keeps going missing before disbursement ? Does anyone understand becuse Amazon support does not!?

Guys I really don’t understand what’s going on with my Amazon seller account, i try disburse every Sunday to pay my supplier on Mondays – the last couple times it said I had for example 2700 ready to auto disburse on the day I was going to do it myself so I let it autodisburse and it only did 1000 (and some change) and I had no more to disburse..

It’s done it again I was going to disburse tomorrow yesterday it said I had 700 and now it says I have 400 . I can’t fathom what’s going on here?

It’s really bothering me and Amazon support literally every agent I talk to have no clue what they are are doing either.

Thanks