I'm playing mtg arena alchemy not ranked, had a very close game with me as the blue/red Vivi deck. Final attack by white player was Sanguine Evangelist in play with mobilize 2 on it, and with 1/1 bat token with flying. They attack and have a 2/1 Sanguine Evangelist attacking with 2 3/1 tokens from mobilize and 1 4/1 bat token with flying. How is it the bat token is not a 3/1 and is a 4/1? I was at 4 life so this match was dependent on the flying bat token that I cannot block being a 3/1 as this would have given me 1 life left and been able to take another turn. Opponent was at 6hp so it would have given me a "chance" to come back. 2 Waystone's Guidance is on the field so I wasn't sure if a rounding error is happening or if I'm just blind, or missed some mechanic somewhere.

Thank you for taking a look at this, let me know what other information you need.