Redduck is based in Korea, due to time zone differences, and whatever, contact with them is slightly impeded, so there's a delay in patches, compared to KAVA, where glitches are probably near-instantaneously patched.
As for UAVA getting all the bad stuff, that may be in turn due to ijji, delaying the updates, drawing out each update for as long as possible, trying to make more money per update.
Same with the capsule shop, I can't remember exactly, but KAVA has 99/99 machines for every gun, and JAVA has 99/99 for cash guns, and 200/200 for euro capsules, or something along the lines of that. Plus their capsules are cheaper.
Again ijji trying to make more money.
The reason why this community is so bad compared to other versions is not because of Redduck's programming