Why have Athena changed their Feed Chart

Anyone know why Athena changed their feed chart? The UK one says feed a max of 2.7ec on the heavy feed chart yet the one on their website says feed at 3.0ec all the way through. This is the feed chat we get in the UK

Just an update on the Athena Nutrients. I have changed to Shogun mid grow and throwing the Athena away, what a waste of over £300. The plants just don't like it, probably my worst grow to date that hasn't had an explainable cause to be so bad. 2 different rooms, 3 different strains. Some of the Indica look OK but not quite right. The Jack Herer look terrible, either over fed, under fed or just unhappy. Iron deficiency was a problem with very high run off PH (during veg) impossible to get down even with flushing. Everything looks at least a week or more behind what it should be.