Not Sure that I completly understand what you are asking, but my guess would be that there was an extra row inserted for some reason. I am guessing that you are woking in drafting and trying to get your BOM on to a sheet correct. If it is that there is just an axtra row in the Parts List, just try to highlight the row, by hovering over the outer edge and then you should be able to Delete that row.
Right click on your parts list and choose Style; switch to the Sections tab and change the value of Maximum Height to a larger value (but smaller than the height of your drawing sheet).