This is not a bug.
Enter find mode with the status tool bar visible at the top of the screen.
Pull down the operators drop down. Note that there are a number of operators listed:
One of those operators is the # sign--which stands as a wild card operator for a single numeric digit.
If you use any of those character combinations that stand for one of these operators, you are entering that operator, not search text.
To find records where you want to specify text including one of these operators, such as Baseline Test #2 or SomeEmailName@Domain.com, enclose the search text in quotes.
If you use
"Baseline Test #2"
Including the quotes, you'll find your records with that text.
Face palm! Thanks PhilMod!! My faith in FMP is restored. :)