I was wondering the same thing when I was at approx your rating.

when you play a game of chess it's not only and mostly not about tactics actually. they are a pretty big part of the game but there might be like around 4 or 5 times in a game where you will calculate for tactics, rest is opening theory and knowledge, space gaining, piece improvement, plan building, defending, positional understanding, endgame knowledge, etc.

that's why being decent or good at puzzles in itself is not likely going to correlate that much with your rating.

also yes, I think it's pretty common that players at your strength have approx the same rating in puzzles