I can't reproduce your error.
I input all of the code from your second example exactly as written and it turned out like your first example. I tried it by itself and then I tried replicating your table based on the screenshot (see below), and in both cases no errant line break occurred.
{| class="wikitable sortable"
|-
! width="33%" | Column A
! width="34%" | Column B
! width="33%" | Column C
|-
| {{loremipsum}}
| {{Symbiosis|name=Groove|food=10|condition=if next to [[Apple Tree]], [[Dandelion]] or [[Straberry]]}}
| {{loremipsum}}
|}
Are you using a different css class in your table? Because sometimes that can cause unexpected wrapping or paragraph problems.