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Rating going UP for getting a problem WRONG???

Here's what happens:
If the puzzle elo is smaller than 1000, and I get it right (in this case did puzzle 1), the puzzle elo INCREASES from 993 to 999 (even though I lose/gain no points)
If your elo is smaller than 1000, and you get a problem WRONG, it sometimes gives you extra points, so somehow it is very hard to go below a rating of 800 or even 900.
And this happened again. There was this puzzle mentioned in the forums that did. The result:

World-Champion (2219) +0 Puzzle 14301 (681) +318

WHAT??? For getting it right the puzzle gets 318 points.
The puzzles have lower-bounds for their rating. They can't go below 1000.

This change was only implemented recently, so I assume their ratings are being updated as you play them.
Ok, but what about players' lower bound? And why can't puzzles below 1000 be reset to 1000? And what formula is used to update them?

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