everytime my .net page reloads after pressing a submit button, the fonts get enlarged.
There could be a number of reasons for this...
It could be your browser settings... it could be that you are displaying text in a Label in one area and in a Localize in another and your browser treats them differently.
To make sure that your page is displayed the same all the time you should use css...it's as simple as: <asp:Label id="myLabel" runat="server" style="font-size:12px"></asp:Label>
....Does your text keep enlarging every time you post back??