can you add a photo Sadie.
it has been a dry spring has it had enough water?
I also wonder if it has been caught by a hard frost. the early warmth would have produced leaves when really the plant should have waited.

You can lightly prune the affected parts off and then new leaves should appear and unless there is another hard frost they should be ok.

I have grown actinidia kolomikta for several years. Mine was caught by a late frost one year, killing all the new leaves. It grew new ones but they were plain green. The following year, it was back to normal

Thanks