Cant get unique items in graph

I have a database that is being populated frequently, but many of the points have the same value. I only want to graph points that are different from the previous point

So here is the graph now

and this doesn’t work as I think it should

the Y axis is the “balance” and I only want to plot dots that have a unique balance

and yes, I have now put in “delete thing” if the balance is the same as the previous