Calculating Investor Gross IRR where you have cash inflows before outflows

We have a new fund (1 year old) which uses a revolving line of credit to fund investment purchases. We used the line multiple times before we called capital from Investors for the first time. Investors received distributions before they ever contributed capital. Because of this, there is no initial capital outflow, so when I calculate Investor IRR I am getting ~31,000% IRR. If it put a ($0.01) cash outflow in first, I'm getting a 0.4% IRR.

I know the 31,000% is probably technically correct since investors received a few million before ever contributing to the fund, but we obviously don't want to report that to Investors. Anyone have a similar experience and able to share how they presented IRRs?

Thanks