Losing IP approx. every day.

Hey guys, Since about 2 patches ago, I've been losing IP (from 50 to 70) approximately every day/ two days. I think it's kind of weird since every night when I stop playing I write my current amount of IPs and it goes down the next day. It's happened about 10 times (more and more recently) and I don't understand. When I log in I can see the normal amount of IP but then it just pops and goes down. Is it only happening to me?

(Not asking for a refund, just want it to stop)

Thanks a lot

See you on the rift