The issue was caused by a CSS rule, that was coming from that Motors plugin. Unfortunately it loads it's stylesheet files globally, causing the conflicting CSS, which set the item height on the search back-end to 20px. I have added a separate rule to the search back-end CSS file to override that via the plugin editor, now it should be fixed.
Make sure to re-load the browser cache to see the change.
I will rather include this minor change in the upcoming release to avoid this problem.Best,
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