fonts are odd in safari

this may have occurred after installing new ilfe (well as it stands just the new iphoto, as iweb caused all sorts of problems and i had to ditch it).

Anyway the fonts overlap on some pages at certain sizes, if i change the size it corrects but then other text that was maybe bigger or smaller can then become muddled, i guess its to do with a certain size.............

the affect is akin to a large amount of negative kerning on the letters causing overlap