One workaround is to use two repeating fields if you can (i.e. a text field with repetitions 2 through 3) and have one with data and the other with nothing. Also, don't think it matters if "Resize Part" is checked on the repeating field -- might just be "Resize Part" checked on ANY of the fields...
This one has been previously reported.
For More Information see: http://forums.filemaker.com/posts/ea146d9cec?start=1&stop=10#189429
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
Thank you for the post.
I additionally added your research to the original report made to Testing and Development.TSFalconFileMaker, Inc.