Formula Builder Cursor Position Incorrect

When editing a formula in the new formula builder, for example in a rich text field, where you position the cursor and where the edit takes places is not correct.  For example I can position my cursor after a field name such as [fieldname] and start typing, but the text I type appears about 4 - 5 characters to the right in the middle of another part of my formula.

Is anyone else having this problem?  It's the same in both Safari and Chrome