When specifying two memory section to display on one chart using comma separation, the bar chart doesn’t display the columns for the latest build.

This is evident on the RAM chart on the plugin wiki page: https://wiki.jenkins-ci.org/display/JENKINS/memory+map+plugin#MemoryMapPlugin-Usage
In the above example the first build shown is #21 and the last is #38 but the axis has labels for #21 to #39. i.e. the bars for #39 is missing.

The attached screenshot from my own job demonstrates the problem more clearly.
Builds #1 to #9 are successful and were built with memory-map configured.
Builds #1 to #9 are listed on the chart axis, but only 8 red and 8 blue bars are shown, #9 is missing both the .text and .bss sections