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This is what I see https://imgur.com/a/d1Es7Et
Highlight only show in topmost gallery. I notice that titles from galleries I visited prior are greyed but maybe this is from 2019 update.
This also happen in other page, not just first results.
I already disable all other ehentai script to help you find out what went wrong.
Previously I have experience with superlatinum's show visited script and his script also cause shifting like ths.