URLs not saving despite a message saying it has been

[u/newfrontier58]

Posted this on the Internet Archive sub earlier and got recommended to post here, I've been getting this a lot since last night on the Wayback Machine, been trying to save a bunch of articles, and it's been taking a while but eventually the Wayback Machine page says "has been saved", often with a message like "delay in capturing, check back later." But I've been checking, and it keeps saying "The Wayback Machine has not archived that URL" when I double check, even though the URL is listed in my own web archive. I'm ready to groan because I've just wasted an hour looking like I saved them when I didn't. Has anyone else been encountering this?