You need to revert to a save from a point before the duplication occurs.
Also, ASM can fix it by editing the save file.
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I often notice that when playing as the Swamp faction, players prioritize building and upgrading Lizards to Lizard Warriors. Why and when is this done, and in what situations is it beneficial?

I often notice that when playing as the Swamp faction, players prioritize building and upgrading Lizards to Lizard Warriors. Why and when is this done, and in what situations?
I often notice that when playing as the Swamp faction, players build and upgrade Lizards to Lizard Warriors as a priority. Why and when is this done, and in what situations?
What should I do if the Lizardmen haven't been built in the Swamp Castle at the start? Should I build Lizardmen or Snakes?
I mainly build Lizardmen, then Sylvans, because at the beginning, I think Sylvans are a better choice than Serpents. As soon as possible, I upgrade to Serpents.
If snakes don't come with the heroes, then the first move is to build snakes – no question about it.
What should I do if the Lizardmen haven't been built in the Swamp Castle at the start? Should I build Lizardmen or Snakes?
I always build 3 mages if there are no or few enemies, to quickly clear the map, then Vasili, 4 Vasili are cheap and, in my opinion, better than 2 Vivs. I don't upgrade the Lizards on the first day, and you don't need many enemies. With the ones you have, you can reduce the stacks of neutrals by luring enemies under direct fire with the 3 mages, and then finish them off with Gnomes, and it's best to start behind Tazar.