problem with add_post_meta and users field

I am happy for your plugin, i like its simpleness.
But after i became a little bit more creative or advanced, i have got a problem.

I needed to make my frontend a little bit more fancy with ajax.
So im now using 2 wp functions: add_post_meta and delete_post_meta.
I am using these 2 functions on a users field.
It works fine to add and delete data, i can see that when i call get_post_meta function.

But when i want to fetch the data again – as i said – it works fine as long as i use get_post_meta.
But if i use CFS()->get(‘fieldname’) its not getting the new data i added. The deletions seems to be ok and done.
And also i can not see the new added data in the administration.

Are you building an extra layer on the meta data ?
And do you have a solution on my problem ?