Category Chart - Problems with x-axis (category axis)

I am using the Chart component with a category x-axis. I have some lot numbers with measurement values. I have two different data-sets for different model numbers. The problem is when they I plot two data-sets to the same chart with the category line/shape renderer the points don’t align with axis.

Basically the data-sets come one after the other in terms of lot (where one ends the other should begin after). The plot is just placing them both ignoring the axis.