When I insert a table in my document the text in the cells looks like it is aligned to the top of the table. Only when I click the remove formatting button or apply the default style is the text aligned more naturally in the cell.

In the second cell I have selected the text and re-applied the default paragraph style. The result is how I want it to be by default. The same result can be achieved by clicking the remove formatting button:

At first I thought it might be cell alignment, but cell alignment is the same for both cells (left top) and changing it doesn't have the desired result.

Even though the default paragraph style has a line-height of 1.15 the line-height of the text in both cells is reported as 1.0 by the line-height drop down in the ribbon.

I have also tried to use the option from the same line-height drop down (image above) to add space before the paragraph (image below, first cell), but that has a different result than just removing formatting (image below, second cell):

The standard paragraph style has 6pt before and after paragraph. The table style has no cell margin top or bottom, only left and right.
So, my question: what formatting is causing the text to render higher, and how can I remove this formatting from the default table style?
Edit: I can confirm this is a property of the table cell, because when the table is empty and I select the first cell and remove all formatting, then the cell changes height. So it's not the paragraph styles in the cell, it's the styles for the cell itself.
See how the (empty) table looks after I removed formatting from cells A1, B2 and C3 (the selection boxes give an indication of the difference between adjacent cells on the same row):
