Different growth but no graft site?

[Suziebun]

Can anyone tell me what is happening with this shrub tree? Its possibly a Lilac. Over the past two years its noticeably started to grow two different leaves and is now dropping those different leaves first.
THe different growth is all coming from the same trunk and there is no sign of any grafting.

Any ideas most welcome.

[Nicos]

Are you able to take a closer photo of the green leaves to help ID side?…then of a few fallen from the other side?

[rary]

If you are unhappy with the shrub you should cut off the part you dont like, if the shrub dies you wont be losing anything of value if its not what you want, though it might be a good idea toget some cuttings off it before you do anything to it

[Snoop Puss]

Are you sure the graft isn't buried below ground level?