Lost competitive points

i’m not sure if this is on purpose, or if it is a bug only i am experiencing. i was around 2800 competitive points, and was excited to get my hands on a golden brig mace. but, after about a week of not playing, i came back on and saw that i had lost 500 competitive points, and i’m now down to around 2,300 competitive points. i would really like an explanation because now i might have to wait an entire season or so.

This seems unfair. I would get it if you were in a decay bracket [Diamond, Master, GM] but platinum. This shouldn’t happen!