Normally we set up the members as vendors since in the normal course of ongoing business we actually receive loans from members after initial startup and pay out monthly interest.
But in your situation since you are in the stages of monthly contributions from members how you have them set up as customers to receive their contributions is absolutely fine.
What is wrong is the items or services you are entering in the invoices, which somehow points to income accounts.
Create a Service for each of the 6 members that posts to their individual equity contribution account. You need to have, if you do not already, 6 srparate sets of equity accounts, one set for each member so you can correctly track each members equity.
We recommend 3 posting equity accounts per member (QB starts you off with just 2). Member1 Equity, Member1 Draw, Member1 Contributions. And so on..
And as an added improvement, make all 3 of these sub accounts of a parent master equity summing account that is not posted to but at a glance will give you each members current equity position.
End of year post profit or loss distribution to each members Member Equity account. On first day of next year close out draw and contributions into their third equity account. Thus you are provided with a yearly look at contributions and draw by member
