I encountered the same situation. It is an unfortunate property of
how players are dropped to the lower bracket. To wit, if player A
beats player B and in the next round player A loses, then player A is
very likely to have a "rematch" with player B within a small number of
rounds. So it appears to be particularly bad luck in the initial
seeding to be paired with another player who is "slightly stronger".
As has already been commented, once player A beats player B, it is
inevitable that they will have a rematch unless one of them is
eliminated before that can happen. While it would be nice to have
that rematch delayed as long as possible, I do not see any systematic
way to ensure this.
The claim to fame of the double elimination tournament is that the
second best team should be able to win second place and in general the
better teams should get to play more. But the second point is not
guaranteed. In a particularly unfortunate seeding the fourth best
team could be eliminated by the second round no matter how many teams
are playing. (Round one #1 beats #2, #3 beats #4 and in round 2 #2
beats #4 in the lower bracket, and #4 is out even though there are
still weaker teams in the upper bracket! Similarly, Round one #1
beats #3 and #2 wins against whoever, round two #1 beats #2, round
three #2 beats #3 in the lower bracket, and #3 is eliminated.)
Claus