https://yootheme.com/support/question/97308
In my tests I could slightly narrow down the problem.
A ampersand character followed by a standard space is transformed to a literal HTML entity &.
But once there is any other character following it, the & is not transformed. An non-breaking space after the & would also prevent the tansformation.
Please try the following workaround:
Edit the menu item.
Remove the space character immediataly after the & and instead type a non-breaking space immediately behind the & character:
To get a non-breaking space on Windows:
Hold down the key ALT then type 0160 (Alt+0160) on the number pad.
To get a non-breaking space on Mac OS:
Hold down the key alt and once press the space bar.
Save the menu.
Reload the page in the frontend and test.
нечайниковский способ - обернуть функции вывода меню в htmlspecialchars_decode()