In OxyPlot_NET40, in BarSeriesBase.cs, in public override void Render(IRenderContext rc)

If I change in line 235 the var baseValue to the min value of my Y logarithmic axis (1 in my case), it works fine.

You can also do this in the declaration of the ColumnSeries :

FYI

The weird thing is it works fine when I do the same thing in the BarSeriesDemo, the difference is that the log axis is on the bottom and the category axis on the left o_O