[Plugin: TinyMCE Advanced] cell content: align top does not work? conflickt with my theme?

I put the “vertical align” of the cell to “top” and it gets aligned to the top in the Editor.
But when i preview the changes it the text in the cell i vertically aligned “centered”.

This seems to be a conflict with the css settings of my theme.

How could i make the cell content appear vertically aligned top?

https://www.ads-software.com/extend/plugins/tinymce-advanced/