Has the graft point changed noticeably recently? I'm struggling to see any other issue. Other than that (and grafts often look like yours) your weeping cherry tree look healthy. If the graft has rapidly changed in appearance, then a disease such as canker could have entered in which case there is nothing you can do, but the tree could easily go on growing for many years before you start seeing dieback in the branches, at which point you would remove and replace. Some decorative cherry trees only live for about 15 years anyway.
A trowel in the hand is worth a thousand lost under a bush.
Hello Bob my tree really healthy full bloom no pests are anything ,only noticed bottom when I was weeding around it, but I did notice that the top half of graft is much wider,than the bottom , I have notified the seller and sent photos ,waiting while the seller asks someone else to look at it ,I have other grafted trees ,non have gone like this .and it was quite expensive thanks bobthegardener.
It is perfectly normal for the trunk above the graft to be wider than the trunk of the rootstock below, so I think you have absolutely nothing to worry about. I can't remember the thread, but I think @Dovefromabove posted a photo of a similar graft where the difference was much more noticable, but still perfectly normal.
Edit,you snuck in there while I was typing, Dove!
A trowel in the hand is worth a thousand lost under a bush.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.