I was testing this together with Freaky and I noticed the same thing. I kept constantly healing for over 1k with koks as you can see from the link below. That's just the 1st heal during looting
https://snag.gy/4vepST.jpg
I swapped to albino whips and just kept healing during looting after few seconds of fight and didn't once heal for over 1k in almost half an hour.
I don't think a screenshot would help as proof of that and I'm unable to record video at work so you'll just have to take my word for it. At least for now.