Miscalculated LP

This has been happening to me recently and I am curious if anyone can shine some insight here... 1. I had won my s2 promos starting with (S2, 0LP) 2. Won my next match with an S, (S2, 21LP) 3. Lost the next match (-18 was recorded in postgame) however the client calculated me back to (S2, 0LP) Either the league client's calculator is broken or I should still have 3LP. This is important because if you lose 2 matches at 0LP you get demoted, rather if you have the 3LP buffer you tend to still have an extra game to save yourself. Has this happened to anyone before? I logged a bug complaint, hoping to receive an answer.
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