I lost 243 elo by breaking even.

So I've been pretty consistently silver for the last 3 years in league, but when I do placements I inevitably get pushed back to bronze. This time was particularly egregious because I went 5-5 in placements, but went from silver 4 to bronze 3. Considering the monumental effort, and investment of time it took to get to silver, this is really frustrating. I'm not angry, just confused. Given the small sample size, I don't feel like 10 games should be capable of creating such a massive shift in rating, especially since I literally broke even.