Scatterplot plots zeros incorrectly

[Mark_Krug]

I have a scatterplot showing Density on the x-axis and %Sinks (percentage of particles that sank at that density). The %Sinks is a calculated field [SinkParticles]/[TotalParticles]. It all works fine except where [SinkParticles]=0 and therefore %Sinks=0%. In this case the points don’t plot at 0% where they should, but at 101% (see red circle highlight in attached screenshot)

. All other points where %Sinks>0 plot just fine. Any ideas?