Some settings of the placehere module are somewhat esoteric and produce unexpected results (unexpected by you, not by me), not because there is something wrong with the module but because of Joomlas strange and idiosyncratic ways when it comes to organising the way pages are displayed. I won’t go into any detail but will shortly explain an option that will cause problems unless you know what you are doing, and you do not know what you are doing because I haven’t provided any documentation.
I’m talking about the setting “link to category” in the module settings. If this is activated, and you have linked titles or display readmore-links will not link to the article pages but to the category page (blog layout page) of the category for this article. That is, it will do if you have a menu link for the category page. If not the setting will screw up the links, even more so if you’re using SEF-Urls. This is not an error with the module code (if anything it is a design flaw in Joomla), it’s expected behaviour (expected by me, not by you) and doesn’t require fixing or workarounds. Simply switch of this option if you do not have a category blog page and the module will work fine.