{tooltip} {end-texte} and so on is special shortcode from ck. I now found out what is causing the problem by myself. ck tooltip is using “htmlfixer” by Giulio Pons, http://www.barattalo.it . This class removes empty spaces so data-caption-title=”A Caption Title” is converted to data-caption-title=”A” Caption Title” and Caption Title” will be removed afterwards.
