Save detail button changes detail scale

I revised some 3/4" details to add a scale bar from the siFX Site/blocks/discipline/north arrow scale menu and noticed the scales were for 1"=1'-0".  I went through the process again and found that when I use the save detail button it changes the scale setting.  it is correct on the sheet, but the block was for the wrong scale.  I tried placing the detail template again but the same thing happened.  I had to correct the scale and save the file not using the detail menu save button.  

Is this a bug?  

Thanks,

Meredith