Q:

favicons on are broken

Favicons are broken on some sites.Some sites show the icons swapped (for example, money.se using movies.se icon). On this meta (and few others sites) the icons aren't swapped :
Same hot network questions being seen on SO , and SO META respectively

money.se

reproduced on ie10 and chrome 47.0.2526.111 on W7 and firefox 38 on ubuntu 15.04
Edit : 
The site with wrong icons starts somewhere near ja.so, and they are using the next (alphabetically?) icon, writes.se (the last one) has no icon atm.
Edit2:
v=93b511aee284 headers :
Request
Host: cdn.sstatic.net
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://meta.stackoverflow.com/questions/332639/favicons-on-are-broken
Connection: keep-alive
If-Modified-Since: Wed, 17 Aug 2016 02:41:01 GMT
If-None-Match: "aeb7f5ca30f8d11:0"
Cache-Control: max-age=0

Response
Age: 1130
Cache-Control: max-age=604800
Connection: keep-alive
Date: Wed, 17 Aug 2016 13:42:09 GMT
Etag: "aeb7f5ca30f8d11:0"
Vary: Accept-Encoding
Via: 1.1 varnish
X-Cache: HIT
X-Cache-Hits: 62
X-Served-By: cache-gru7125-GRU
X-Timer: S1471441329.750093,VS0,VE0

A:

We have a static content deployment race where the CDN might end up caching the wrong (old) version of an image.
This is what you were seeing.
We are working on fixing our deployment process so this doesn't happen, but have not solved it yet.

