Wisteria graft losing leaves

My brand new little Wisteria grafted plant was repotted about a month ago but leaves turned brown this week, but not all of them as the pics show. Am I overwatering? It's in the potting shed and I had it in the window, too much heat and light maybe? It also has little shoots growing so I'm pretty sure it's not a terminal issue. Any help you can give would be gratefully received. J
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No expert....but I think you're right about the heat & light, too warm inside, get it out in the garden.
The leaves look fine, mines the same. It's just the colour of the new growth, they soon green up.
Great advice Kitty thank you. I've never grown one before so I'm probably fretting too much. Tks lots.
Still learning myself moviebabe. Mine started off as a twig in a pot like yours, it's gone crazy this year, now over 6ft high
Here's a snap of my "brown leaves", hope it reassures you.
And the whole plant. I need to pot it on and chop the top off. I'm trying to grow mine as a standard (lollipop), rather than a climbing vine.
Mine has been outside from the start, 2yrs now.... I think