See the diff.
Phabricator doesn't seem to be able to produce a table cell with two paragraphs in it, so this what the wikitext should have looked like (and what was wanted) in the table cell:
|- | Other cell | [[Link]] New paragraph |-
But when it saved, the result was
|- | Other cell | [[Link]]<nowiki/>New paragraph |-
which renders differently (and screws up the column widths).