I only run one masternode per wallet. Just easier that way, less of a headache. You can run multiple wallets on the same computer. See https://github.com/TokugawaCoin/Tokugawa/blob/master/Tokugawa%20Single%20and%20Multiple%20Masternodes%20setup%20Guide%20.txt for how.

As far as your coins splitting, you can enable coin control features (Settings>Options>Display>check box for "Display coin control features (experts only!)". Now, when you send coins, go to the Send tab and click the Inputs button. Expand the list and check only the amounts you want to pull from, leaving your masternode's 2500 unchecked. This will make sure that you do not accidentally send your masternode coins.  

When you send coins, it sends the entire input amount of each selected, then returns the change to your wallet. This is how almost all cryptocurrencies work. For example, if you have 10 TOK in one input and only send 5 to someone, you send the whole 10 and 5 are returned to you. This change is sent to a change address associated with your wallet. To set the address the change goes to, in the Send tab, check the "Custom change address" checkbox and enter the address you want the change to be sent to.

Hi. i have a problem...2nd masternode....1 vps...1 wallet...first i had problem wallet took coins to staking.but i add at .conf ..staking=0 and it works..but now when i send 2500 to mn1..it move the other 2500 of mn2 to another address inside the wallet...when i send back to the mn...it split and move from the other mn....so i have 1 mn always full enough of coin...but never the other...it's look like a joke..its like hide and seek.
Any suggestion?
Thanks