Thank you for your post.
I am unable to replicate the issue using FileMaker Pro 15.0.1 (and 15.0.2) under Mac OS X 10.10.5, Mac OS X 10.11.6 and macOS Sierra 10.12.2. All tests were performed under 100% zoom. At the bottom is the PDF Preview result from my last test (15.0.2 under Sierra).
Do you have any plug-ins installed/enabled? If so, temporarily disable any plug-ins and try again.
I checked my print settings and found that zoom was at 95%. Setting it to 100% corrected the problem.
Removing plugins did not correct the problem.