What's the first button you instinctively reach for when you want the character to jump?
It's usually the lowest button on the controller regardless of what system or generation, that's how buttons are normally mapped to by default. You don't go against the system especially if it's a technical action game like Devil May Cry or Bayonetta.
The first Devil May Cry game mapped the jump action to the Triangle button. That's right, it's on the highest button on the gamepad for reasons I failed to understand. The buttons also cannot be re-configured so you are basically stuck with unlearning what you learnt through years of playing these games.
Thankfully as I tend to have multiple copies of these games, I discovered that the Japanese version of Devil May Cry doesn't have this type of insane button mapping. Jump is actually mapped to the X button like how it usually is. For once, owning multiple copies of the same game actually paid off and I can put this import copy to use despite have to start all over. Or if you are not the nostalgic type, you can always pick up the HD collection as it's seems they have fixed this problem on the HD reissue.
This anniversary re-issue is actually pretty sweet, it comes with a bonus soundtrack disc and a nice new cover art. When I first bought it, I even got a bonus DVD of the wesker report and trailers for other Capcom games. Those were good times, too bad it never lasts as with all good thing.