Multiple custom menu order

I have set up multiple custom menus in one of my Google Sheets. While the items in the menu stay in order, the 3 menus that I have created are always switching places. Is there a way for me to order them in the script to stop them changing order.

I have used and onOpen function (see below) for each of them

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  // Or DocumentApp or FormApp.

I am using multiple projects. All 3 menus show up and work on the workbook, but they keep changing order.