Probably I didn't explain myself very clearly, in these cases I think that an image is worth a thousand words.
This is peggie's meter with a rating of 9.02:
This is peggie's meter with a rating of 9.1:
This is peggie's meter with a rating of 9.15:
Basically, with the second decimals Peggie's meter is bugged, it puts a comma but no digit to its right. It's not a matter of how many digits you'd like to support, after the first decimal place it doesn't handle it, so either a rounding function is needed or you can also decide to drop all the decimals.
Hope I've been clear enough now, can't do better than this.