Castlevaina error at level 5

I'm playing Castlevania, not Legacy, as I only own the original non Legacy version.

I've got up to level 5. Actually, I'm almost past level 5 as well, I've saved at the white crystal just before the last boss. This is after I've blown up the wall with Nitro and Magnawhateverthethingwas. Anyway, I now have a save where all I need to do to fight the boss is step out of the place, crystal's already activated and everything, and the game is on normal.

Here's the problem though. Every time...

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