Can't use half star ratings

I am using the software reviews feature of the plugin and there are many scripts (which I am reviewing) that I want to give 3.5 stars, 2.5 stars, 4.5 etc. but I can’t seem to select half stars. I should mention that I am using this plugin as an addon to the inbuilt rating functionality of the InReview theme from Elegant Themes. I am not sure if there is some sort javascript conflict going on.

Regards,
Matt

https://wordpress.org/plugins/all-in-one-schemaorg-rich-snippets/