I just realized I said about the Preference theme when this is the Celestial forum, lol oops (I seriously need a vacation). But I will be doing an update for Celestial Reloaded as well, including the Portfolio. In fact, all this month I am dedicating time to updating my previous (older themes) and the portfolio is one item I am rebuilding and going to try it as a plugin. But the style and layout will be fixed for sure.
First thing you will want to make sure that each item post has a thumbnail that is the same size, plus, an intro part, so if you have some without content, this could cause the layout issues.