Why does my Acer look like this?
The pot it was in was damaged by frost so I repotted it in spring. It seems the the new leaves it has grown are much bigger than any I've ever seen on it before. I can't tell whether it's because its been potted on (although the new pot isn't much bigger than the old one so there's only a small amount of space and new compost around the edge) or whether it's because I moved it to an area it prefers. It was already in quite a shaded and sheltered area and I've only moved it over my a metre or so. I suppose it is even more shaded than where it was previously. Should it have had leaves this large all along?
Apologies, I'm on my phone and can't seem to find an edit button to turn the picture.
Apologies, I'm on my phone and can't seem to find an edit button to turn the picture.

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Your Acer may be grafted.
Are the bigger leaves growing from below the graft.?
I have turned your pic but cannot see detail clearly.
I also have some larger leaves growing in a few other places including at the end of a much higher branch. I've tried to place it next to one of the other leaves to show the difference.
Looking closely the stones are very near the main trunk so I cannot see the soil to see exactly where that branches is coming from.
I would recommend removing the stones completely and putting composted bark. But not too touch the trunk.
Remove that very bottom branch
Other pics not clear enough . Sorry