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seem that content copy & paste from MS office. for content editor, jomsocial using joomla text editor plugins it self. text editor are not perfect. sometimes they not filtered "dirty" code in properly. you can edit that Discussion for fixing it and you can changing to other text editor from Jomsocial backend > configurations > layout > Use Text Editor.
FYI: not all text editors can works, because depend with the plugins it self.
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