I usually keep all but my Gourmet pet in the resorts. When the Xentu was released, I got one and immediately put her into the Lakeside resort. Her time was up today, but I can't put her back in. Every time I do, this page https://subeta.net/explore/resort.php takes me here https://subeta.net/explore/resort.php/checkin/one?days=1&pet=5869070

Which states that she's already in a resort. Except that she isn't. Even the resort page shows her as not checked in.

I'm not sure how to manage this issue.