I've downloaded the source and trying to understand by debugging the code.
It appears the behavior I'm describing is contained within the "paintOtherLevels" method of the PlanComponent.
Unfortunately I'm not a native Java speaker, so it's taking me more than a few moments to grok it, but I'm getting there and have a little more free time over the holidays.

I'm sorry that I'm new to the forum...does a lack of reply by anyone mean:
- I have never seen this?
- I have seen this, but it doesn't bother me?
- I have no clue what this guy is trying to say?

Just curious if I should just patch this for myself or suggest it as an improvement to the maintainers?