You work in an Indesign document? The forced sorting with ; is a work around in Index-Manager especially for InDesign, so, that you can handle the forced sorting for Word and InDesign in the same way. With InDesign-Documents Index-Manager will always display the ;form.
When you export/embeds the entries in InDesign, the ;form will disappear and InDesign displays the entries in the correct form. I made screenshots, which I will send you directly.