I move from name->comment->date->amount with TAB and when i add the "amount" if i type the dot then adds 2998.00.my-nymber-after-dot (no need to press enter). If i don't use dot, some times when i type a number (ex 1234) if i do it quickly adds 1234.00 - but if i do it slowly i saw a 12.00.34 or 123 ...

I update to 10.8 (mac os x) and after that a double zero (00) adds when i enter an amount.
Any ideas how to fix it?

you can see the screenshots

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