I think I got something similar when I was trying to buy PolyCUB with pLEO. I was expected to lose like 1.5% but I didn't lose that much in the end. It was only like $20 worth of pLEO and I got a lot closer to the amount I was expecting. So I think the swap menus just get confusing when going through multiple pools. For pLEO to PolyCUB, it had to go through like 5 swaps.

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