Problem with DDS

[antithesis]

hello there! I am happy to work with this program, but have little problem. Last times I am working with DDS files and noticed 1 fact: if i resave file WITHOUT changes it is saved with another file size, looks like it was 16,1 KB - changed to 4,12 KB, but i just used "save" and nothing more, MAYBE same working with another formats, but i really need fix it because image size is important for me in this moment, so why this happens and how to fix it, tnx a lot

[xnview]

Only 1 image is saved in DDS by XnView, so multiple texture will not be loaded/saved