Created attachment 122737 [details] sample This is because the tspan's font-size is set to the the tspan and the text element when it should only be set to the tspan.
Xisco Fauli committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=85c789be1f94777b582977e69b16665a47dc364f SVGIO: tdf#97941: Don't double tspan fontsize It will be available in 5.2.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.