Ok ...no need to panic 
What has actually happened is that Yangge has probably mistakenly uploaded the same zip a couple of times without realising it was the wrong zip being uploaded.
I just checked that entire library [search narrowed as you suggested] ..downloaded all of them and checked them. Even used AndreasV's "iconifier" to check them as png's [larger sizes].
I found just two mistakes, and both of them were with Yangge's icons ...being that the wrong zip was uploaded to it's corresponding preview. The rest were fine for me.
Are you sure that when you were downloading you didn't allow a zipfile you already had on your desktop/download location to be replaced with the new download? [with the same name]
...it happens 