1. Open a page and add a block if needed for content
2. Open the Row popover and click Advanced Controls
3. Click on Border Radius - see how the sliders for PX and EM go to a max value of 50. Leave it at 50 and close the panel
4. Reopen the same Advanced Controls panel on the row and navigate back to Border Radius
5. The max values are now 5 instead of 50

If I ship a design with more than 5 the end user won't be able to get it back to the starting point once they open the control.