Incrementing a cell of Real datatype seems to have different behaviors depending if increment is done by up/down keys or by buttons in the cell. 

Incrementing using up and down keys: Every few increments trailing zeroes show up (due to a very small decimal that is added to the float)

Incrementing using SpinBox buttons: The number is sometimes rounded up on the first increment, and then increments normally after that.

To reproduce:

1- Create two cells of Real datatype

2- Insert a decimal in the first cell and start incrementing a few times with the up and down keys.

3- Insert a decimal in the second cell and start incrementing a few times with the buttons.