The last version of Moodle supported by Elegance is M3.1 (https://moodle.org/plugins/pluginversions.php?plugin=theme_elegance). The tabs thing I think was introduced in M3.3 and hence not made for it. Thus bugs! Therefore use the browser development tools (F12) to figure out what the problem is.
Themes
duplication of course titles and image is enlarged
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