cash shown in mutual fund balance

I have noticed that i have somehow got cash shown as part of my balance in a couple of my mutual funds.

There is no such cash and i dont know how it got there

My question is how do i delete this cash balance

when i click on the cash line it says "you cannot update the cash balance of a single mutual fund account. Use update share balance instead"

my problem is that the share balance is correct!

I just need to delete the cash balance but i can't figure out how to do it?