Thank you so much for your reply!

We're currently seated in a two-seat row and no other seats are available in similar rows. If I switched our seats, we'd end up in either a three-seat or five-seat row. Plus, if my seat is still showing up as available during check in, how can I be sure that any other seats I select won't end up presenting the same problem? These are the main reasons I'm a little hesitant to switch right now, but I'm definitely contemplating it.

According to checkmytrip.com, our seat assignments are "confirmed," and my boarding pass shows the seat I initially reserved. And Lufthansa customer service told me everything looks fine, too. I'm just afraid that no matter what I do, it'll end up being the wrong choice.