When I, in a word document linked to Indesign add a style which begins with the name of anther style, followed by a comma (no space) and more text, InDesign does not recognise that this is a new style but instead treats it (and calls it) by the other (shorter) style name. Workaround is to e.g. use an underscore instead, but it took me quite a while that is was this issue that caused the strange indesign behaviour.