When you click the Components Button in Order Entry for a line item that consists of a Bill of Materials (BOM) the Component Description displayed is the BOM Master Item Description.

This is a setup issue for the BOM.. Go to I/C Items - Bill of Materials.. Select your Master Item

Double-Click on the Component Item to bring up the I/C Component's Bills of Material screen.

If this description is Blank, then in Order Entry, it will inheret the Master Item Description.. 

Whereas if you enter a description here it will show in the Order.