Doesn't save options properly

I’m changing the code for the Source link to have a target=”_blank” in the link, but when I go to save it, it does not save it. It will only save if I change the word Source to something like Original Source.. it saves the words Original Source, but never saves the target=”_blank” in the url part. What am I doing wrong? Everything else seems to work (other than, the fact that I can’t change the blockquote code either and have it save. Trying to change: <em><a href="%1$s">%2$s</a></em></p> to <em><a href="%1$s" target="_blank">%2$s</a></em></p> Thanks so much! Charles https://wordpress.org/plugins/press-this-extended/