Okay, I may be just confused. I'm a total newbie with this stuff.
I got a used copy of "Puzzle & Dragons: Super Mario Edition" at a Gamestop, and when I started playing it, it behaved in a strange way (I know, this sounds like the beginning of a bad creepypasta) When I went to "power up" (or if it powered up during a battle), if it powered up my fighters, it would level me up to level 50! I was so excited! It made the game so much more fun. Much easier to grind through the levels. However, after a little bit, it stopped working.
I missed this "feature" so much that I looked online to see if there was a way to replicate or fix it. I found this "cheat/exploit" for the game on fort42 (/ar3ds/game1847/834/) and when I scanned the QR code, it worked for a little bit, but then randomly stopped working again.
When I try rescanning it again, it just goes into the N3DS browser and says "exploit running", but it doesn't fix/change anything in my game.... any ideas what I am doing wrong?