Why is the subitem not displayed on the contextMenuStrip if called on the right click event of the DatagridView?

Question

C++ / C#

The problem is the following. I call the context menu of the DataGrdiView. Everything works and everything is fine. But it does not show nested menu items. Moreover, if you assign the same contextMenuStrip to the form and call it. Everything is displayed there. The photo shows the same menu. Called on the form and called on the DataGridView.
Why can this be so?