Concatenate not working in Numbers Sample numbers file



B4 contains CONCATENATE(B2,B3)

In the file above, I am getting syntax error on B4, despite the formula seems correct. Can anyone reproduce the problem? How can I solve it?

MacBook Air, OS X Yosemite (10.10.5), Numbers version: 3.6.1 (2566)
Some locales use semicolon as a separator for parameters in formulae, such as Turkey. You can check this by using a comma after the first parameter, then clicking a cell. If you see a semicolon being inserted alongside the comma you should use a semicolon as a delimiter.

                                

This feels like a bug. Copy-pasting the cell shows the syntax error, but copy-pasting the contents of the cell (the formula itself) works fine, alongside me retyping the formula. You can provide feedback to Apple here:


http://www.apple.com/feedback/numbers.html