Well, it's an artificial pronunciation, maybe out of emotion in the verse; when he sings "si pudiera dejarte atrapada..." he pronounces "dejar" naturally.
Don't worry, you will find many pronunciation eccentricities... there are many singers who believe they add something by changing vowels for semi-vowels (similar to schwa sound), changing Spanish "t" and "d" for English sounds (even if they don't speak the language)... they're strange people.
