I found that it only happened on the particular Font I was using. It is a corporate font. I tried another standard windows font and do not see the issue.

Thanks

Hello Greg,

In order to understand the issue , i set up a sample and on button click i am setting the cell texttrimming , so that i have clear visual clarification , although when i run the sample and click the button i dont see any vertical shifting.

I attached my test sample here for you to have a look and modify if i am missing something.

Also just to know there is another way of handling long cell value instead of ellipsicalCharacter , it using ShowOverflowIndicator. 

In my sample i included the code of ShowOverflowIndicator also , you can have a look if that something you are interested with otherwise we can continue discussing your vertical shifting behavior if you can share a reproducible sample .