IP disappearing

When I log in, I have IP somewhere in the 4000's, I minimize the client and my ip is magically lower than what it was. Now its at 3900's

a minor but annoying bug that scares me. I did not buy anything between screenshots.

https://gyazo.com/6c8d18a201f7237126cd6be69c30397c https://gyazo.com/eb1a6cc7905883234ce697a018da85f4