bug or is it that rank scores go down if you do not play ranked games for awhile?
After a period of inactivity it will decay down to 1400 if it's above there. If it's 1400 or below it shouldn't move
I recommend the bug forum in that case.
Every 4 weeks of inactivity results in Elo decay of 25, down to a minimum of 1400.
After 4 weeks, you drop 20-25 elo every week.
Quick fix, play a ranked game every once in a while
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