Can you include some code or a screenshot?
I would guess you are using "System" controls. These are designed to mimic the appearance of the host OS, so they are supposed to look different on different platforms. This is in contrast to the native LabVIEW controls (Classic, Modern, and Silver), which look the same everywhere.
It could also be your fonts - the default for Front Panels in LabVIEW is "Application Font", which again, is platform-dependent.
Can't say for sure though without having a look at the problem.
