The violin has a shipping charge but BidSlammer reads free shipping. Also, there is a reserve and Bidslammer indicates that the reserve has been met but the current bid is $2.50. What is going on? Is it something to do with this eBay seller?

I had a similar situation last night with the same seller.

Hello Joseph,
Thank you for your question about the ship charges. We can investigate that item number to see exactly what is going on. Thank you for the helpful information. We will respond soon with an update.
The ship calculation is a new feature, so I'm not surprised if there are a few corner cases it doesn't handle yet. :)

Hello Joseph,
We will release a fix for this issue within the next 48 hours.
Thank you for the report. We welcome any follow-up comments or further suggestions you may have.