To try to find the root's problem, I went to the website you've mentioned and searched for spider.
I did find 3 different png of the "same" image, all of them with different size and quality, all of them smaller than the one you did put in your first post.
https://www.pngwing.com/en/free-png-yhctq > has badly cut surrounding white > Not indexed
https://www.pngwing.com/en/free-png-mafkv > seems to be the best version but is very little (512 px), and gray > The only one indexed with a strange palette https://imgur.com/6REBVbx and https://imgur.com/VTC9eu1
https://www.pngwing.com/en/free-png-zhlgs > no anti-aliasing, has ugly "stairs" all around > Not indexed
I did stop there to search as I go thru so many pages already, but none of them match 100% yours.
Some solutions to investigate?
Maybe try with the one you uploaded on G-F? direct link > https://www.gimp-forum.net/attachment.php?aid=12366 , why try with it? because it's on a Linux server and it would be interpreted by Firefox, should it makes a difference? No... but we never know, in all case that's the one we all tried with positive opening in GIMP
If you could recall the page and give us the link it would be nice for us to test with the original, or maybe it was just a temporary download problem on your side?
I did find 3 different png of the "same" image, all of them with different size and quality, all of them smaller than the one you did put in your first post.
https://www.pngwing.com/en/free-png-yhctq > has badly cut surrounding white > Not indexed
https://www.pngwing.com/en/free-png-mafkv > seems to be the best version but is very little (512 px), and gray > The only one indexed with a strange palette https://imgur.com/6REBVbx and https://imgur.com/VTC9eu1
https://www.pngwing.com/en/free-png-zhlgs > no anti-aliasing, has ugly "stairs" all around > Not indexed
I did stop there to search as I go thru so many pages already, but none of them match 100% yours.
Some solutions to investigate?
Maybe try with the one you uploaded on G-F? direct link > https://www.gimp-forum.net/attachment.php?aid=12366 , why try with it? because it's on a Linux server and it would be interpreted by Firefox, should it makes a difference? No... but we never know, in all case that's the one we all tried with positive opening in GIMP
If you could recall the page and give us the link it would be nice for us to test with the original, or maybe it was just a temporary download problem on your side?
Patrice