Hey Rctorp,
first of all, thank you for using Ikebana!
From the first glance it looks like there might be a function that filters the content template tag in an unwanted way, however, I will be able to tell more when we run some tests: the first thing I will need to ask you to do is to disable all plugins that are currently activated in the multisite installation, refresh the page, and see if the problem goes away; if it does, enable plugins one by one, checking the page in-between, in order to determine which plugin causes the content to disappear and let me know which one. In case the content doesn’t show even with all plugins off, please also let me know, we’ll troubleshoot further. Thanks!
Sincerely,
Andrii / Satori Studio