If you open https://demos.telerik.com/reporting/designer?_ga=2.145120566.369274565.1605642252-790264781.1600201366 the problem can be seen.
Select one of the TextBoxes such as TextBox1
Select the Layout > Size Properties of the TextBox
Try to change the Width to 3.5 in.
Notice the Width goes to 35 instead of 3.5
This is the same case for Location > Left & Top and Size > Height