Today when I went into my gog galaxy I noticed that Kane & Lynch 2: Dog Days - Complete Edition was gone from my owned games list anyone else having this issue?

it's a server issue, i can't use galaxy without problems for now, and sometimes some links stop working

I was trying to open a support link but without success, after few times it works but all gog links are very very slow or don't work at all

Is it the only game missing?
And did you - by any chance - buy the game from some cheap third (key-reseller) site?

Then there might be a certain chance that the key you bought, was bought with a stolen CC, and the game got revoked because of that.
Always buy directly from GOG!

(if you have bought the game here on GOG - you may disregard my comment, of course)

Yes, gone from GOG Galaxy but still listed in the library on the site.

You can try the refresh links in a browser and see if that helps:
https://www.gog.com/account/refresh
https://www.gog.com/user/refresh

I also have this issue. Kane and Lynch 2 is gone from Galaxy, but not from my library on the website.

I bought it from gog when it was on discount with the first one. Thank I've checked and it is still in my website library.

I tried renaming the storage folder under C:\ProgramData\GOG.com\Galaxy but that didn't help. Once it finished reimporting everything, the game was still missing from Owned Games. So it does look like a server-side problem.

Yeah it's back for me as well.