The glottic stop is a type of consonant sound used in many spoken languages, produced by obstructing the flow of air in the vocal tract or, more precisely, the glottis. The sound is produced when the vocal cords close and stop the flow of air. The gap between the vocal cords is called glottis. The pronunciation of the glottic stop is usually associated with the letter T (but also P and K).
So which is correct?  Both pronunciations are correct. In your English studies, we recommend using the standard version and, over time, you will become familiar with the other.