If you put CA on the fittings(Mickey Mouse last resort) it will be a temp fix but why did it happen in the first place?
My guess is if you are using a pen mill either you scarred the tube while inserting the mill with the DP running or there is some kind of burr at the end of the mill(Usually a piece of CA glue.
Also if you CA the parts in, WAIT until the glue has time to CURE not just set.
Otherwisw you might experience a "white bloom" over the paart that aare in close proximity to the glue.
(DAMHIKT)