This is probably why - see the final sentence.
Auction-style listings
If you select the auto-relist option (if available) when you create your listing:
- Auctions with a duration of 5 days or more will be automatically relisted up to 8 times
- Auctions with a duration of 1 or 3 days will be automatically relisted up to 8 times as a 7-day listing
- Auto-relists are free, except for listings in vehicles categories
Automatic relisting is available for most categories, but there are some exclusions (see below). If your item doesn't sell after 8 relists, it will appear in your unsold items - opens in new window or tab.
Keep in mind that the automatic relist option is only available on listings created by new and occasional sellers. The option will not show for other sellers.
https://www.ebay.co.uk/help/selling/listings/creating-managing-listings/relisting-items?id=4147
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
