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Usually that happens if:

1)  you accidentally hit a comma before the 42 cents, instead of a period.  (those two keys are adjacent on the main keyboard

or

2)  You are located overseas from the USA and you have your computer set to the regional setting for some European country.....then if you do hit the decimal before the 42 cents...the computer the treats the period as a comma and #1 happens again.  The solution in this case is to set yoru computer's regional setting back to the USA...(some European countries use commas for the decimal point...and periods for what USA folks would use as commas))

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*