backup wallet should work fine, it can take a while. On occasion, some people have had to hit the "reload blockchain" under the "file" menu. The extra 5000 coins may be due to interest earned even though you haven't actively staked. I'm not sure how the algo works exactly, but from my experience you seem to earn interest whether or not you stake. My wallet was offline by accident for about four weeks and when I got it back online to start staking again, my block rewards were initially A LOT higher for a few days. So I speculate that even though I wasn't staking for a month, my overall accrued interest seemed unchanged.