I have created a simple project based on your description. I tested with both the latest internal assemblies and dlls from the last official release. I was unable to reproduce the issue that you have described. I have attached the project I tested with and a snapshot of the output (for the snapshot I have used dlls from the last official release 611).
I will suggest that you download the latest version of our controls and see if the issue persists. If it does, you can send a small project (all the code for it) and a picture of before and after zooming in. This way we can look for where the problem hides and do our best to fix it.
Currently I can only make a blind suggestion to set the Width of both the horizontal and vertical axes labels to a certain Width:
I suggest this because zooming highly depends on the size of the visible labels and when the labels change (respectively their size changes) the chart has to readjust the size of the plot area and pan offset and this might lead to slight displacement.
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