My wallet and explorer show different balances:
https://explorer.dash.org/address/XjjgWrGYeXmphT1tiT4BVXegCid9MAYKf6
And there is 12.25 in my wallet (dashcore-0.12.1.5-win64).

Also there are strange transactions of > -2 DASH in explorer. But I only did many small transactions of 0.1 - 0.25 in that days...

WTF?