fuzzy header text and grainy images

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Okay, so a little while ago, I accidentally deleted my database (It was labeled as being for a different domain URL). The files were intact, and when I restored the database and all that, the header text was really fuzzy and the images are really grainy. I'm using chrome. And on I.E. the header text is Not grainy - but it's much smaller - smaller than I want.

My question is, when I uploaded those pictures to concrete, they were all really high quality. Why are they grainy now? And why is the text fuzzy?

Two points:
1) The picture files are stored in concrete subfolders my file manager.
2) I totally "reformatted" -- I started a fresh install of concrete, and then all I did was transfer the theme over. And when I add header text, it's fuzzy. Note, this is a custom theme that I created off of a HTML and CSS source.

Any ideas on how I can fix this... I'm newer to HTML and the other stuff than I'd like (but I'm learning!) (I mean, I'm pretty good with HTML... just ... not pro). Thanks so much!!!

-- Brian