Impossible to have a decimal point in reviews

Hello, I downloaded the plugin today. When completing the “Reviews” fields, it doesn’t let me include a decimal point in the rating field. For example, I like using stars from 1 to 5. But it doesn’t let me use 4.1 or 4.2 (etc). I have to do 4 or 5, but nothing in between. I tried with a comma and it also didn’t work.
I realize I can use percentage, and it will cause the effect I want on the rating stars. But it’s not an ideal solution, I have better results with 1 to 5.
Am I missing something here? Or it’s really not possible to do this?

Thanks and Regards!