I have added a Facebook Like button to the sidebar of my XF-Forum.
since a few days, my FB-Like-button in the sidebar is cut-off at the bottom, so it is not showing the full button (the line at the bottom of the FB-button is missing).
It's difficult to know what the issue is without seeing it but you will just have to adjust the HTML and CSS accordingly to get it to display correctly.
my FB page-name is quite long, so the wording "on Facebook" breaks into the next line.
so the FB-text is actually longer than the width of the XF-sidebar.....