Win10/Word 2016

I'm working on a table--it's a process script, so it's about 6 pages long. I'm doing some editing when suddenly the table page breaks. I look at the page above, and there's more than enough room for the row that has been moved to the next page. I display non-printing characters, and see this:

table weirdness.png

The arrow is pointing to the mark that Word added to the table--it's clearly associated with the page breaks. But I don't know why Words inserted it or how to remove it. The thing is, I wasn't even editing that row when it happened--I was editing the row below. If I remove some text from row 12, the page break goes away.

Any ideas?