Thank you for your post.
It appears the font rendering is different on the Mac than on the Windows machine? What font is being used for the Checkbox field?
If you increase the left padding, does this help?
Any other information you can provide may be helpful.
Text on a windows machine will require a few more pixels of space than the same text on a Mac system. It's always been this way and working with a layout on Windows that was originally created on macs often results in unintended clipping and text wrapping. If you then enter layout mode and adjust the object's size to eliminate the "clip" or "wrap", the layout generally will now look OK on both platforms.
Making the field larger to accommodate the text did not resolve this issue. Making the text smaller from 12 pt to 10 pt did resolve. Very simple fix but I guess I was set on having 12 pt that I didn't make the change. Thanks for the help.