Blame your fellow members. That's who decides what the theme of the puzzles are, and unfortunately many of the most enthusiastic voters are apparently among the least knowledgeable. And all of us who are too lazy to cast votes... And management for being too cheap to hire some bright young intern/chess prodigy to check the puzzles.
Puzzles miscategorised under 'opposition' tactics theme on chess.com?

Blame your fellow members. That's who decides what the theme of the puzzles are, and unfortunately many of the most enthusiastic voters are apparently among the least knowledgeable. And all of us who are too lazy to cast votes... And management for being too cheap to hire some bright young intern/chess prodigy to check the puzzles.
Ah, that's disappointing. Thanks for the reply.
If I choose to do tactics by theme on Chess.com and select 'opposition', the puzzles given don't seem to match the definitions I find when I type 'chess opposition tactic' into Google:
"In chess, opposition (or direct opposition) is the position in which two kings face each other on a rank or file, with only one square between them. Since kings cannot move immediately adjacent to each other (see Rules of chess), neither king can advance, creating a mutual blockade." - Wikipedia
"Opposition occurs when the kings are separated by one square." - Ragchess
"A king has the ability to dominate the movements of the enemy king by a technique known as opposition. It consist of placing your king in the same rank, file or diagonal as the opposing king, with an uneven number of squares in-between the two kings." - From a list of 56 chess tactics on chessfox.com
Some puzzles under 'opposition' on chess.com:
As far as I can tell, none of the above puzzles match the Google definition. There were some other puzzles rated around 1800-1900 I tried to solve before I tried to look up what opposition was which I didn't get screenshots of. These didn't match the definitions I found either.
I did find one puzzle in this category where the kings get close after exchanging rooks:
If 'opposition' means something else on chess.com, I can't figure out what could be a unifying theme for all these puzzles. Does opposition mean something else here, are these puzzles just mislabelled, or am I just being stupid?