This is also a problem with LibreOffice Version: 5.3.1.2, Build ID: 1:5.3.1-0ubuntu2 on Ubuntu 17.04.
Curiously, this problem only happens with opened Calc files. When creating a new Calc document (yet to be save, close, and reopened) the menu correctly displays "LibreOffice Calc" for the program menu. Once I close and reopen that newly created Calc document the problem occurs; likewise, the problem persists when I save/reopen the old-versioned Calc document.
This is also a problem with LibreOffice Version: 5.3.1.2, Build ID: 1:5.3.1-0ubuntu2 on Ubuntu 17.04.
Curiously, this problem only happens with opened Calc files. When creating a new Calc document (yet to be save, close, and reopened) the menu correctly displays "LibreOffice Calc" for the program menu. Once I close and reopen that newly created Calc document the problem occurs; likewise, the problem persists when I save/reopen the old-versioned Calc document.
See attached screenshot.