No, that's definitely not correct. I'd have to look into it more, but the FB Like button has a separate width value. I'm not sure if, in our LinkedIn extension, that value is hardcoded.. but it looks to be the case. My guess is that the width is set too wide, which is causing it to overflow to the next line.
We'll look into a fix / adding a width parameter. Until then, we'd honestly recommend switching to the button-count look which is similar. It doesn't have the text next to the Like button and is fixed width, so it should all be inline. If you really want the standard look, just let us know, and we'll try to get you some code to fix that look for now until we can release a full fix.
Thanks,
Alex