I have just inspected the page and it looks like all the meta tags have been applied to your pages. In regards to the keywords, I would suggest that you ensure that they appear in the page content and title and Rank Math will take care of the rest.
Please take a look at the screenshot on the sensitive data section of how the page source looks.
I have added a screenshot to the sensitive data section. Please note that meta keywords won’t be displayed in the page source since we do not have a field for this in Rank Math. Google also stopped recognizing this kind of meta data and this is the reason why none of the major SEO plugins have this field anymore.