Hi Chucky,
On other sites, is your avatar larger than a maximum of 80 x 80 pixels? If so, that may be why it's not blurry there and is blurry here.
In other words, if you have to resize the avatar to fit the required maximum dimensions here at The PainterFactory, then save the JPG again, both reducing the size and saving again could result in lower visual quality (i.e. blurriness).
If you have the original image at a larger size, so you can save directly from that file, try resizing it to max 80 x 80 pixels, sharpen the image a little, then save it in GIF format to avoid JPG's "lossy" compression. Since the image is all flat areas of color, GIF format should work just fine.
In Painter, to sharpen the reduced size image, use Effects > Focus > Sharpen and adjust the Highlight and Shadows sliders as needed. I usually try 50% for both sliders and if that's too much, I use Undo, then adjust the two sliders lower.
Cheers!