Frequently a customer will pay an Advanced invoice

Example invoice - AD40002660 on order M202923 was paid however the CD970180901 did not auto-match/pay upon issuance.

As of now, I did manually match the advanced payment however this happens rather frequently where It should match automatically  

May you assist to investigate a route cause, whether this is avoidable, or a system issue?

With thanks,

 Any help would be greatly appreciated