We have to zoom out of Chrome to 50% in order to see the page numbers when replying to problem tickets. I have included a video: https://watch.screencastify.com/v/iqoiZe33ilQMoXqMdxTs
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I would recommend reaching out to our Customer Care team via the steps shown in this article so they can take a look at this for you: Contacting Zendesk Customer Support
This is likely something we won't be able to troubleshoot in the community so they'll be able to assist further.
I hope this points you in the right direction!