Small percentages result in misshapen progress bar

When I enter a small percentage (<10) into the shortcode (“progress=6”) I find the progress bar is slightly misshapen on the left side. In particular, this seems to affect the border radius, causing it to appear different to the right side of both the progress part of the progress bar and the background.

I’m testing this on a local dev environment, but as far as I can tell, this is a result of the implementation method so affects the plugin in every situation.

https://www.ads-software.com/plugins/progress-bar/