Hey Jonas,
regarding the category/other taxonomy grid: the standard Visual Composer built into Shogun does not have this feature yet; you might want to look at this VC add-on plugin, I suspect it has what you need. Also, here’s the full list of VC addons, there are some handy ones among them.
Regarding the Posts Grid element: I’ve tested the feature using your settings and hasn’t been able to duplicate the problem. Would you be able to provide a live URL of the page in question? (ideally, admin access would speed up the troubleshooting even more of course)
Sincerely,
Andrii / Satori Studio