I think that’s because the viewport width treats the page as desktop, so it works (as indicated by the sidebar, which is seen in desktop).
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Have you tried changing the Viewport based mobile mode site setting?
Hello 
The issue is that the Discourse Jira plugin adds position: relative to .post-controls .actions.
However, this doesn’t work because nav.post-controls has overflow-x: auto, which clips any overflowed (floating) elements — such as those added by Discourse Reactions.
This only happens on mobile (viewport.sm), because overflow-x: auto is applied there.
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We disabled the Jira plugin and it now works. Thank you so much @Don you’re amazing 
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