The plumber came in this morning and did a supply line check.
No issues.
He mentioned that it looked like a crappy tiling job.

Spoke with a foundation company and after the obvious questions (are
the walls cracking, doors/windows sticking, etc), they said the
foundation sounded fine.
They admitted it may have shifted a bit but not settled or cracked.
They could schedule someone in February to come look at it if I wanted.
I declined.

Spoke with a tile guy after all that, and he stated he's been getting
more calls this week about tiles popping than in the previous weeks.

Therefore, I reached the conclusion that the tile job was crappy.
Thankfully, that will be the cheapest of the fixes.

Thanks for everyone's input!!