bars.RemoveLastBar(isRealtime); multiple calls

[zwentz]

I was trying to find out why my custom chart type isn't plotting correctly, and I came across this forum post. Specifically, NinjaTrader_Dierk says the following here:

Check out "bars.RemoveLastBar()" in case you needed to replace last bar. Don't try to remove more than one bar by multiples calls in a row. Note: this is beyond what we provide support for.

He states that you shouldn't do multiple calls which is exactly what I'm doing:

//if we addedthree last time, then remove those three bars; otherwise just remove the bar we added
                if (addedThree)
                {
                    bars.RemoveLastBar(isRealtime);
                    bars.RemoveLastBar(isRealtime);
                    bars.RemoveLastBar(isRealtime);
                }
                else
                {
                    bars.RemoveLastBar(isRealtime);
                }

What's the reason you shouldn't do multiple calls in a row. And could this be causing my issue?

Thanks.

[NinjaTrader_Austin]

zwentz, as Dierk said, this is unsupported.

[zwentz]

Right, was just looking for the reason why you wouldn't want to make multiple calls.