There could be several reasons for it:
- Model has same custom property. If yes then delete that.
- Drawing sheets property is set to use properties from sheet 1 or view one. To check/fix this, right click on the sheet and select properties. And now check the sheet properties and see if it set to view on sheet one or not.
Second option was right, as I explained custom properties were different for each configuration so I had to apply your second suggestion and it worked.
For this type of part I would set up a design table and in the design table create a Part Number custom property, so let's say type in $PRP:"Part Number" in the top cell of the appropriate column and then in the drawing make a note with $PRPSHEET:"Part Number" - now it will pull the info from the design table and insert it in the drawing or.....
You can go to the different configurations and in the File Properties -
Go to the configurations tab and add Part Number and then type in the Value
That's how I've been working on custom properties, thank you