Is it possible to stop the removal of all digits when I try and change the leading digit?

E.g. If I have 234.78 and I click between the 2 and the 3 to backspace and change the 2 the whole number is removed and I have to enter it all again.

For any other number this works.

I have to remember to click in front of the 2 and add a new number and then remove the 2