Custom R Visual not showing category values once published to service

Hello all,

We have created a custom visual in R and it is working great in desktop; however, once I publish to the service, the category labels disappear and are replaced by NA and nothing is plotting appropriately.

Here is a screenshot of what it should look like versus the result.
Desktop result:

Service result:

We installed the correct version of ggplot2 and double-checked all the packages were compatible, unsure of what we are missing.

Thanks for your help,
T