I've had som issues with the healing function today. It worked flawlessly yesterday

I've the healing setup like this
90% exura ~3% 20 mana
70% exura gran ~3% 70 mana
50% exura vita ~3% 160 mana

So I went down to 2% hp today and I thought , yeah exura vita would be a good heal to make now.. Then it did exura went down to 10% again and then I did exura vita manually.
Anyone else run into this issue, or was it just me failing somewhere? :S
Sorry for the inconvenience!