“Frankly, they, the crowd, had all heard the disciples speak in their native tongue. “
The operative word is “Heard”
There were more people groups than there were speakers. If you don’t believe that count them. The miracle was in the hearing not the speaking. The disciples were probably speaking Aramaic. Understanding this places a whole different light on the gift. The disciples were not aware a miracle was happening until after it had finished.
Acts 2:4 And they were all filled with the Holy Spirit and began to speak in other tongues as the Spirit gave them utterance.
Actually, the miracle was speaking in different languages. Verse four confirms that.