No, I'm pretty sure it's supposed to be either 10+14 or 10+10 (CZ-USA site has only these), but after a month of searching for a RAMI and reading a number of people fussing about getting 14+14, this is my theory.
Retailer has both 10+14 and 10+10, runs out of 10+10. Customer calls and asks for 10+10, dude thinks about it for a sec and says, "Sure, I got one of those right here." Goes and opens up two guns and swaps a 10 for a 14, sells a 10+10, and now there is someone later who ends up with 14+14...