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.
I executed this command and came out this value:

{
"split stake threshold set to " : 2000
}
Do I need to change something? Thank you in advance.
Thats the reason your output split. If you have a target block size you can use that set command to set it to the target. The blocks won't split until the resulting blocks are at your target. Basically the blocks can grow to 2 X's the threshold.
okay, thanks! If I want the blocks to be no more than 20,000 coins, do I need to make a command set 40,000 to have a split?
It depends on what you mean by "I want the blocks to be no more than 20,000 coins" Do you mean your staking blocks, or the result of splitting? IE when the block is 20K do you want to split into 2 10K blocks. Or do you what to wait till the main block is 40K and then split into 2 20K blocks. In those cases you would set it to 10K or 20K, the results of the split. The value is after you split. 40K is not the answer. It's either 10 or 20K.
Personally I have a hard time remembering how this is supposed to work. It would seem more logical to have the value to be the point at which a block would split. and not the result of that split.
Yes, I need this option.:
"Or do you what to wait till the main block is 40K and then split into 2 20K blocks."
Easier for me to share and connect blocks manually, is there a command to turn off automatic splitting of coin?
I don't see a way to actually disable it. But... "setstakesplitthreshold 999999" would disable it until you have a block of 2Million.