I have tried every trick I could think of to make this look right. Not possible due to the nature of this table (left column).
The only way to make this look right is not to break the table.
Turn off Page Breaks for the table. Then you get this while it still fits on the same page
and when it does not:
This keeps your table intact BUT you cannot predict when it jumps to the next page and it could look really odd when you have a larger table (many rows). And what does not work is when the table is larger than a page. Because it does not break then - no space anywhere it get cut on the first page:
it took some time until I was able to replicate your "issue" and I think I succeeded:
Well, this is not a bug but the attempt of the renderer to make things match. The growing textfield content is not of the same "height" as one of your internal, right side row elements. It calculates the remaining space until the page end and will fill a gap with empty if the remaining size is less than the height of your TextField row. Because you have lines all around you can see the gap. You would not get it if you would not have a dynamically growing right column row.
You can even see this in the design when you adapt the previous objects in height
Since this is a conflict situation for the renderer I don't think you would get rid of it if the general setup of your layout is as shown.
You could obfuscate the page break by removin the lines of your internal textfield row - but that is just hiding the obvious
I am in the category stubborn - I tried a completely different approach, throwing away your table and creating it with subforms.
Now, there are compromises. Can become more complex, and the left column text will only show in the first row - which can also grow too much if you have a lot of text in there. But the page breaks look quite ok. There is script in the left text field - you may have to adapt depending on what should be shown on the left. As I say, not perfect...