Are you sure you have images in both places??

Because you are using a relative path, the images are stored at a location relative to the document directory. (fees%20payment%20notice_files/image002.gif
)

Case 1:

Document path:

D:\Data\Projects\Casula Vet Hospital\Document Portal\some.html

Image path:

D:\Data\Projects\Casula Vet Hospital\Document Portal\fees%20payment%20notice_files\image002.gif

Case 2:

Document path:

D:\Data\Projects\Casula Vet Hospital\Document Portal\documents\A Chapter 1 general notes\some.html

Image path:

D:\Data\Projects\Casula Vet Hospital\Document Portal\documents\A Chapter 1 general notes\fees%20payment%20notice_files\image002.gif.