Hi! I have a question. In my account was 4 and 16989,05 HYP. I started POS mining and a couple of weeks later I got 1000 HYP. After that payment my 16989.05 + 1000 HYP split into 2 AND now I have 8994 and 8994 HIP. Why did this happen? I combine my coins to weight online? I'll take some screenshots, thanks.

Go into the console in the wallet and type getstakesplitthreshold. You can change that value with setstakesplitthreshold . My understanding is, that would have to be smaller then 8994 to split your output. I'm not sure if or what the default is.
This feature is nice to automagically prevent your blocks from becoming to large.