The buttons in the top right of the images are quite legacy. The CSS suggests that there are four kinds of buttons here, however, in practice I could only see two, and it seems the template has some parts that are inactive? Those templates come from XWiki Enterprise, migrated in 2013:
The templates content did not get checked since then. My guess is that the code quality was not on par with xwiki-standard since it's from XWiki Enterprise, and noone updated it since it worked okay enough for what we needed.
The solution I'll propose it to remove all hard-coded icons in style, and replace them by actual DOM icons in the two places where I could see/find them get generated.
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