put $2.5k into a mid-cap through a dex and walked away $180 short, what went wrong?

swapped $2.5k worth of ETH into a mid-cap token recently. the preview showed 3% slippage, I set my tolerance to 4% and went ahead. came out $183 below the quoted amount. the pool showed roughly $800k in 24h volume so I assumed it was fine. I

s this expected at this size or did I mess something up?