Others have said the same. It's another current glitch. Probably best to hold off until things are sorted out. You can end them via the dropdown menu arrow, far right of the item on your selling page > End listing. Or use this link: https://www.ebay.co.uk/help/ip?topicId=4146
glad it’s not just me losing my marbles. I was changing it as I’ve always done but it shows as collection only then seconds later changes back to a postage situation. And I’ve already done as you suggested and ended the items. thank you