Most likely your rom or your emulator has been damaged in someway. You should try going to the main page of emulator zone and redownloading the emulator.
If that doesn't work you might try saving it by a file, instead of in the rom it's self. Ex. Use the save option instead of the save game option. If you want to load it go to the load option not the load game option.
Yes it is normal for it to save very fast when using save game, if you want to see if it worked it will show some red text at the bottom left of the emulator screen that says "saved 1 state", or "saved 2 state" (what ever slot you saved in)


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