Looks like the wallet occasionally reports the wrong amount of coins available also. After a rescan it works itself out. We need some serious bugs fixes.
Yes, same here, its wildly off, I rescanned and reloaded the blockchain and it still cant add up, it seems to be when coins are staked the maths goes wrong.
My observation is that this happens when the wallet still gets on the wrong blockchain. I had this going on on 2 separate machines and when the blockchain reload, sync & wallet re-scan was eventually done on the correct blockchain, the balances got right & stable with staking enabled and working.