If you enter a number like 21005.34 and realize after that it's incorrect, you are can place the cursor on the two zeros but you are unable to more than a single character, because immediately after editing (say with the backspace key) the cursor jumps to the end of the input and if you edit again you are affected the last character (in the example above it another backspace would delete the 4)
Same occurs if you place the cursor and then attempt to insert multiple digits ... first digit appears in the correct place and subsequent digits appear at the end because the cursor has jumped to the end.
Try entering 21005.34
place the cursor behind second 0
press Backspace twice quickly
If you enter a number like 21005.34 and realize after that it's incorrect, you are can place the cursor on the two zeros but you are unable to more than a single character, because immediately after editing (say with the backspace key) the cursor jumps to the end of the input and if you edit again you are affected the last character (in the example above it another backspace would delete the 4)
Same occurs if you place the cursor and then attempt to insert multiple digits ... first digit appears in the correct place and subsequent digits appear at the end because the cursor has jumped to the end.
Try entering 21005.34 place the cursor behind second 0 press Backspace twice quickly