I would be much obliged if you could say why. I really love to learn these vernacular differences.

Google Translate is not a source of truth and sometimes just does ''AI'' things.

https://dle.rae.es/mordita?m=form

https://dle.rae.es/mordida

https://es.wiktionary.org/wiki/mordida

https://es.wiktionary.org/wiki/mordita

https://en.wiktionary.org/wiki/mordida

https://en.wiktionary.org/wiki/mordita

This is what I was looking for.

Because I learned this from informal situations in the US something like 30 years ago, it stuck. But, surprise, surprise, the pronunciation was just an approximation, and led me astray.

Mordida it shall be forevermore.

Muchas Gracias.

Not sure but searching mordita in a dictionary just gives Esperanto