The "Pixel Fairy" when posting some new images to gallery

The gallery provides a plugin that automotically generates a new post into a related 'Discussion by Gallery genre" board.
The images will save OK to the gallery, but occasionally - The' Pixel Fairy' appears and saves your images to the post generated as very pixelated.
This is because for some as yet unknown reason it posts the automatically generated 'thumbnail' version at full size.
The fix is simple. Just revisit the post and select 'Modify'.
In the last section of the image file path, you will see that before a bunch of numbers, you will see the prefix 'thumbs_".
Just remove "thumbs" and the underscore, resave and it is fixed. Sorry for the inconvenience. When I notice them " will rectify.

(This appears to be occuring straight after I have made and saved changes the admin settings for images, like increase in storage, or whatever)