Emoncms feed & kWhd do not match

Posted this up yesterday but it's disappeared somewhere.

I added a new feed (kWhd_grid) to my existing feeds list & noticed that the feed 'value' doesn't agree with the bar graph value.

I noticed that my original kWhd engines were MYSQL but the new addition is PHPTIMESERIES but I don't know if that's relevant.

I've also included today's printouts where the bar graph has increased by some arbitrary amount

Any suggestions as what the problem is??