I have been using in all my planes the Dubro #161 tank cluck/filter.

I use these in both my gassers and nitro planes.
I was having trouble with my plane with a OS 1.60FX in it and found that the brass tube had come completely out of the filter stone.
Has anyone ever seen this? Is it a fluke?
Should I be using something else?
I have two filters on my fill cans and thought this would be an extra way to prevent dirt.