Hmm, I am unable to reproduce it on the exact same step as in your picture. Try doing a full guide reset.
1. exit WoW
2. go to the WoW/_classic_/Interface/Addons folder and delete the ZygorGuidesViewer folder
3. go to the WoW/_classic_/WTF/Account/<your account name here>/SavedVariables folder and delete the Zygor files in there
4. run the desktop client and install a fresh copy of the guides
5. go back in game to test and let me know if that fixed it
1. exit WoW
2. go to the WoW/_classic_/Interface/Addons folder and delete the ZygorGuidesViewer folder
3. go to the WoW/_classic_/WTF/Account/<your account name here>/SavedVariables folder and delete the Zygor files in there
4. run the desktop client and install a fresh copy of the guides
5. go back in game to test and let me know if that fixed it
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