This bug has happened to me multiple times since the last patch and it also affected the Streamer NumotTheNummy on Youtube video (See times 4:00 and 19:40):

https://www.youtube.com/watch?v=qZk5slnADh8&ab_channel=TSMFTXNumotTheNummy

While drafting, sometimes the card you pick will be replaced by a random other card in the pack. This is very disconcerting.

It turns out that when this happens, when you submit a deck with the wrong card it gives an error message "deck cannot be submitted".

Once you exit the draft, you find the original card you picked back in the deck.

This is a severe bug which occurs frequently that was introduced in the patch with the New Capenna set.