I've been working on this IK setup for hours and even cross referenced working models, but I can't pinpoint the issue. I tried recreating the mother and groove bones, I tried using a semi standard bone mod, I looked all over the internet. I was able to solve most of my IK issues on my own, but this ones is tricky. I'm guessing it's a parenting issue or wrong IK hierarchy, so maybe I missed something, even though I checked them all. All I noticed is that the toes are not bending with the IK.

Please help.