Hello Bryan,
Welcome to Atlassian community!
I understood that you are using JIRA Cloud and once you type @ to mention users in a comment from a specific Linux computer the user's list is not displayed, however, from other Linux computers it works properly. Is it correct?
If I understood it properly, here are the four most probable possibilities that can be causing the problem:
1 - Make sure you are not logged with different users on both computers
2 - Try to clear your browser cache or try incognito mode in the computers which you can reproduce the problem
3 - Check if the browsers that you are using are not configured with any blocks to Atlassian domains of IPs - Try to configure it in the same way it is configured in the computer which works
4 - Check if the computer is not on a different network and may have a proxy or firewall that might be blocking Atlassian IPs:
Atlassian Cloud IP ranges and domains
Let us know if these instructions helped.
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