I saw something strange in JCS. When you "mask" a tile on what you want add some event, and press E (it is hot key for Events), go to Pickups > Ammo > and select Bounce Ammo +15 (maybe it works on +3, too, didn't test it), and when you click on OK, on tile what you "masked" and on what you want that event, write this: Gun3 +15. In game, Bouncer is on number 2. The same thing is for Freezer ammo +15. It shows Gun2 +15, and in game it is on number 3!

jj2 has lot of rushed/unfinished features. developers kinda rushed the event list/JCS.ini too.

Man, how long were you JCSing without noticing it?

I noticed today and I am JCSing pff 5 years ;P

JCS.ini has a lot of weird labeling/categorizing/bad events/etc.

It's pretty easy to fix the stuff you don't like though. I reorganized mine so everything makes a bit more sense (though it's not perfect). I uploaded it to j2o for those who care about that sort of thing. Note that the version there isn't totally up to date and in particular lacks the JJ2+ lori start event.