Any Ideas What Is Up With These Two Dimes?

If both sides of the coin are off the same amount, the planchet (blank metal disc) didn't sit in the chamber properly, and it's called an off-center strike. If only one side is off, then the planchet was in the right place, but one of the dies wasn't properly centered. This is called a mis-aligned die (sometimes abbreviated MAD), and I believe that's what you've got here. Either way, collectors aren't generally interested unless the error is severe enough that the coin is missing some lettering or other design element along the edge. While they may not be worth anything, I still think they're neat when you can see the crescent of bare metal on one side.