My header rotates a smaller version of a header image.

I only have one image in the header folder, but when load the page, sometimes I get a really small version of the image, and sometimes I get the normal size of it.

When I first uploaded images, I did accidentally add a smaller version of the image, but I have since erased it.

What can I do to maintain the larger image consistently on top.

make sure you don't have a thumbnail in the header image folder