A friend pointed this out to me.
The two prices differ for the same product.

Not Good.

You get 25% off each game if you buy all three as a bundle... or 10% off individually... not that hard to comprehend

From the news post...

Quite the tilty pleasure.
Epic Pinball: The Complete Collection is now available exclusively and DRM-free on GOG.com with a 10% launch discount until December 7, 2PM UTC. Buy it together with the Jazz Jackrabbit series and get 25% off instead.

Ummmmm yeah. XD

I wonder what happened to reading comprehension.

Exactly what Bigs said. If you untick one of the Jazz Jackrabbit games Epic Pinball should show the same price as in wishlist.

There have been some instances with games where selecting "Buy Series" shows one price, but once it enters your shopping cart, the cost automatically adjusts to the proper price of any bundle the game is a part of.

And having bought this as the bundle I know that isn't the case here.

Yes GOG's site throws up pricing errors occasionally.... but more often than not when people think it's wrong it's user error.