I have no idea what the current issues are with Hubpages or what has caused it this time but I have been noticing little glitches like these for a while now.
Sometimes stats are delayed but normally not as bad as it's been the past week. My stats report says I made 0 earnings on Wed which must be incorrect. Maybe it's still not been fixed properly, who knows?
Really what can you do about it? They will no doubt fix it as fast as they can and we can hope it doesn't happen again.