Grid Lock vs Unit Lock in Microstation /J

We have noticed an oddity in using Grid Lock and Unit Lock. Setting the Unit Lock to 0:.0468 is not an issue. But, If I try to set the Grid Lock Master units to the same number, Mstation/J changes the input to 0:.046752.  Normally, we would set our Grid Lock to twice the Unit Lock.   (Our working units are 12/2032).  This slight difference compounds the further from 0,0 you get. Is this issue related to how these parameters are stored in Mstation/J?

Thank you………