Maybe your problem is occurring because you have either:-
1 - A dirty rifle?
2 - Wear on the extractor spring, possibly broken or gunked up..or wear on the extractor itself?
3 - Have bent the ejector a little while cleaning?
The solutions i would try are....
1 - Give the rifle a good clean.
2 - Remove and inspect the extractor spring for defects/dirt.
3 - Check the alignment of the ejector.
If there is any wear on your extractor itself then you can always get hold of the Volquartsen 15-22 extractor, which gets glowing reviews.
If the spring or plunger look damaged in any way try Numrich for spares.
If none of the above are causing the issue then you can check out these threads and see if it went anywhere
So I decieded to make a brass deflector
SWS Brass Deflector is now available
Failing any success there...there are many brass catching options available via mainstream options....there are a few folks on here who DID manage to get the custom made 15-22 brass deflector....looking online it seems that it is no longer produced...maybe one of these guys got bored and would be willing to part ways with theirs.
You can but ask