Final boss audio bug??

[Señorita Sombrero]

Okay so, im fighting The Shell Stealer and his voice lines just... Doesn't play, in the fight some sounds like the parry one or the attacks that The Stealer do doesn't play either, and overall the music is kinda glitchy, how do I fix this?

Edit:The gameplay is AWFUL in the fight,I had no problems with lag or something like that until that point. I want to beat the game like its supossed but this is just unplayeable. I guess I would use baby mode