Nikki,
I got your message and tried your image from Flickr. It seems to come in fine for me, although it is a bit grainy. Did you resize it to 1000 px before uploading to Flickr? If so, you should not resize before uploading to Flickr and let Flickr handle any resizing for you.
This is what FILL looks like:
This is FIT:
And CENTER:
Are you still seeing something different?
My advice would be that none of these options look great because this image is not very well suited for a Map Series main stage. The text in your description panel will overlap the logo in the middle of the image at most browser sizes/screen resolutions, which is not ideal. And some of the collage photos around the edge are getting cropped out in some positions (so you may see half a fish, etc.).
The best types of images for Map Series main stages are usually single photos (not collages or images with logos/text). If there is a logo in the image, it's best located on one side (rather than the center/middle) so that the descirption panel doesn't overlap it. Another idea would be to put your AZ Trout Challenge logo in the side panel and a nice single photo (or looping vide) in the main stage.
Do you think some of these options would work for your story?
Owen
Owen Evans
Lead Product Engineer | StoryMaps