Button access

I have a legacy Excel program with all kinds of formulae, macros, protection etc. all over.

There is a button which I'm unable to right click. I just want change it but I can't see the button anywhere else in the Design Mode, VB Editor..
All I have is a button whose left click works and a calculation is performed.

I removed the protections, set low security levels etc.
I searched all over.
But I can't find where the button is actually defined.
It just appears cells J9:K10 (i.e occupies 4 cells J9,J10,K9,K10)
I can't move, resize, right-click or view its properties anywhere (where in for some of the other buttons I can).
The only place I could get to know the name of the button is in its click event (buttonName_click).
There are no events written for disabling right-click.
And I searched by the buttonName if it was disabled elsewhere but didnot find anywhere else.

I know this question wouldn't make sense unless you view the sheet directly.
But I'm hoping someone came across such a situation and would reply..

Is there a kind of lock where controls can be locked from performing any changes? How to work around this?

Thanks
ap