Would you be able to post a list with what mods you are playing? I explicitly am using the event on_gui_closed, which most mods don't mess with (they could forcibly close the gui before I see the event and act on it), but I also realized I look for exactly requester chests and buffer chests by name. The latter requirement is more likely to be the issue.
The mod also could be ignoring recipes depending on their name... in the start-up settings there is an option which prints out the "good" recipes, which is the most debug I have for that (maybe a later version I'll have a separate setting to print 'ignored' names).