Ok some more digging and I discored where things go really wonky is January of this year when I redeemed most of the MM cash to buy a new position. Prior to that the OOP Historical %Gain was in the 5% range which seems a bit high but entirely within reason.
I bought a new position for almost all the money leaving only about 100 dollars in the MM fund. The cost basis at the point was lower than the amount of money I withdrew so the cost basis went negaive and making the OOP Historical %Gain N/A at that point. As I recorded new dividents the oop cost basis increases and finally passed zero moving from N/A to large %. Couple that with the fact the MM basically pays 0 interest right now.
With each subsequent divident recorded the cost basis increases and in theory the % will get smaller.
The only other thing I have been doing that I don't believe would impact this is I am buying positions monthly skipping the money market account. So I add the buy in and then go into the MM and delete the coresponding transaction. All numbers have lined up and started a bit after that first big purchase this year.