Strange CC editing behavior

[doodi-v1]

Moving the cursor to mid account number to edit produces strange results. Type in: 4321 0000 0000

A partial card, and spaces were auto-inserted. Move the cursor to the end of the first set of zeros, backspace twice and type 98, the result will be: 4321 00 0000 98

The result should have been: 4321 0098 0000

I think it should honor the desired result or, if not possible, not allow mid-string editing - somehow.