I don't know what i did but somehow now is working like a charm.
I move everything to a single controller, and all the problems are solved! the more probable scenario is that i mess up something, so i restart with a different approach making one single controller for all the admin (so easy with groceryCRUD!) and that worked quite well... may be is what you say in your post, about to move to a function different from index, now in the index i only have the welcome screen.
Once again, thank you very much for your support, your patience and your code. I hope i can give you something back with a donation if finally i get paid with that, and in every project i use your awesome library, you absolutely deserve it.