I somehow didn't get a notification for this post so I didn't see it, so sorry about that!Yep pretty consistently double eggs every few days, she also lays a Normal egg in there too. These eggs aren't shell-less but definitely thin shelled. They have a hard outer shell that is easy to break.
Here's a video of the curious phenomenon. 1st egg is laid at the beginning second is laid at around 00:35:30 on the camera time.
But crazy she laid two shell-less eggs.