I think the leaves are just young and unfurling. I'm more concerned about the dried up black leaves. It doesn't look like typical 2,4-D damage and the crops around us have only just been planted. I don't think they sprayed. I'm a bit worried about 2,4-D and Dicamba ready soybeans. Would they spray before planting?
Have you applied a fungicide yet? The damage looks similar to some phomopsis infection. I don't see a lot of stem damage yet but some looks to be there. The look of the leaves looks a lot like phomopsis foliar damage. There are a number of effective sprays for phomopsis and black rot. It could be some type of herbicide damage but I am not convinced yet.
That could be the problem then Greg. Phomopsis and black rot are both early developing diseases when not sprayed early enough. Generally when shoots reach 3-5 inches you should begin a protective program. It is easier to prevent than eliminate later. Even if that isn't what those vines have you will still benefit from the spraying.
Probably not relevant to this plant problem, but 2, 4-D is a broadleaf weed killer. It doesn't kill everything. That's why you can spray it on your lawn and it kills the dandelions and plantain, etc, but not the grass. It can also be sprayed on wheat (wheat is a grass) to kill broadleaf weeds. Grapes, being broadleaf plants are affected by it and are very sensitive to it.
Something like this hit my frontenac and frontenac blanc in spring of 2016 when shoots were about 6 inches long. Many of my shoot tips just blackened up and fell off. Univerisity extension said it was probably anthracnose based on my description and what they saw in my area. They recommended liquid lime sulfur (nasty stuff) before bud break. I followed their advice this year and whatever it was did not return
Frontenac is not supposed to be very susceptible to either phomopsis or anthracnose. Go figure.