Problem saving raw files in photoshop as jpegs?

so i shot my images in L raw, in professional mode. went into photoshop and edited them and saved them at max res jpegs but now im in a site that blows the image up to 12x18 (not big at all) and its telling me the image has low res. Am i saving the image wrong as a jpeg? i can only upload jpegs with this site.
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