Pretty clear it was meant to be $32, not $23. Good on them for honoring the sale, even though they made a mistake - that's not the act of a stupid individual. taking advantage of someone on the other hand...
Once, and only once, I offered to rectify a winning bid by taking the sale price of a number of sovs from way below spot to spot. An extra $600 offered. The slimy so and so ended up trying to rip me off even after chasing me for the money when declined to pay when things felt wrong. If the seller gets blatently ripped off then there is no guarantee that the buyer won't have hassles. This is a small error so hopefully the seller will honour it or the buyer will show some honour and meet halfway.
I come from a three generation line of family retail, on both maternal and paternal sides. Before I could write cursive, I knew 'The customer is always right.' As a business principle in my family it was bedrock. A merchant stood by his word, even if it cost him money, to please the customer. I see that item going for 'buy it now - $26'. That is market price, not $32. $23 is a good bargain, just what every buyer wants. No one knows how much the seller paid for that item. Their cost may have been $5, or $45 - no one knows. Maybe they doubled their money on that transaction - nobody knows. The seller has different obligations than the buyer - they are not equals. I sold over 500 items on ebay, and if this situation happened to me, my ancestors would roll over in their grave if I asked the buyer to pay more than I had agreed to, and it doesn't matter who initiates the 'correction' - I refuse it regardless. That is just how I was raised, others will see it differently.
