Hacking Corrupt Data In Some GBA Games

[LeonardoGolden]

I got Yoshi's Island and Mario VS Donkey Kong on my M3.

Whenever I load Yoshi's Island, it gives me a "Your saved data is corrupted" message.
When I load MVSDK, it says "ERROR: Saving is disabled."

It doesn't happen with my other games, so, why does this happen?
Can it be fixed?

I'm using Sakura 1.34, if it helps.