[Plugin: Socialize] Buttons suddenly started overlapping

I have used this plugin for a long time, with the Facebook, Twitter, and Google+ buttons aligned horizontally at the top of each post. Suddenly, without any change on my part, the buttons have started overlapping. Specifically, the Official Facebook Like with box count, the Official Tweet with vertical count, and the “tall” Google +1 button, the Google +1 button is suddenly appearing to the right of, but also on top of, the Tweet button. It seems as if the Tweet button might have moved over to the left a bit, since there’s a larger space than I remember between the first button (Like) and the Tweet button. This is the same on all sites on which I use this plugin. Is this a change on the part of Twitter?

Thanks for any help!

http://ww.wp.xz.cn/extend/plugins/socialize/