The multilingual plugin Polylang allows using the same tag for different languages. This was not supported by hashtagger yet. If a tag already existed, this one was used. The brand-new version 3.4 of the hashtagger plugin now works together with Polylang and enables usage of the same hashtag in several languages.
The new version also introduces another option to allow hashtags starting with numbers. Commonly hashtags are not allowed to start with numbers. Activating this feature allows yout to use hashtags on your WordPress blog that are incompatible with hashtags on Twitter, Google+, Facebook and other sites.