I mean the menu that pops up when you mouse over your user name in the upper bar. It shows the number of games and money in wallet from like two months ago. I have a different number of games now, I can see them in my library and everything, but in this menu it shows a number from a couple of purchases ago. Same with wallet. It says an old amount even though when I click it to go to the actual wallet screen I can see the real amount I have in there.

Also Wishlist. I bought a game I had on my wishlist, so the number of games in the wishlist decreased, but in the popup menu it says the old number

so what's up with that?

The wallet thing is bloody annoying, and I didn't realise that until you mentioned it.

A little bit worrying too, do I have to start checking my order history to make sure that GOG hasn't lost my credit somewhere?

GOG can't exactly lose your credit, but you might get confused if the number in the popup menu says you have a 20 in the wallet all the time, regardless of whether you bought something or added more money into the wallet. The wallet screen at https://www.gog.com/en/wallet should always show the real amount. It also shows all the movement in the wallet further down on that page, so you can see when you added funds, when you made purchases, and you can make sure yourself that the amount there is correct.

But I myself wanted to buy something the other day, thinking I have like 20something in wallet after looking at the popup menu number, and then I was confused why does the checkout screen want more money from me instead of just proceeding with wallet money because I didn't realize the popup menu number never updated after my previous purchase from earlier and I actually had less money in the wallet, which I then confirmed by looking at the wallet screen.

Cheers, I had forgotten about that part of the wallet page, it's more useful than the orders page in some ways.

If my history is correct the balance on my dropdown stopped updating (or reverted to) some time between the 25th and 29th of November last year.

This started happening around the same time as "0 games" on the profile page. People were slower to notice because for most, those numbers don't change very frequently. There's the pull down menu changed? thread from December 3rd, and I brought it up in the My profile shows zero games, why? thread on December 23rd.
If you log out or clear cookies, the numbers in the menu will disappear altogether. You can still get accurate totals on the respective library, wishlist, or wallet pages, though that's not as convenient.

Also, if you or your friends get achievements, you'll probably notice these are missing from the left side of the profile pages (aside from the Recent Achievements box).

A staff member passed on these reports on January 25th.

Galaxy was failing to update itself a few days ago, causing performance issues on the platform. SOS SNAFUBAR LOL

I know GOG "should" know this already as anyone with a web browser with an inspector can check it, but sometimes the small things are missed when you are overworked.

When I load a page, the javascript tries to access this page presumably to get the numbers:

https://menu.gog.com/v1/account/stats?locale=en-US&currency=USD&country=JP

and the JSON returned (HTTP 401 header) is something like:

{
message: "Unable to authenticate."
}

If it helps.

I was nice enough to point out how to fix this to GoG but so far nothing
https://www.gog.com/forum/general/my_profile_shows_zero_games_why/post119

In short:
In the JS file ([url=https://menu-static.gog-statics.com/assets/js/v2/bundle_min.{random_string}.js]https://menu-static.gog-statics.com/assets/js/v2/bundle_min.{random_string}.js[/url]) you need to update the variable "accountData" in your "MenuConfig.prototype.setUrls" function.

Its currently assigned to a URL that needs authorization, which fails and doesn't grab the users stats to update the dropdown menu/profile page etc.

Reassigning it to equal 'this.gogMenuHostname + "/userData.json"' will fetch and update the users data correctly.

In my case, since they repaired the profile page, the numbers in the menu are gone completely.

Noticed that as well, the numbers haven't changed for me in a couple months now.

A member of staff passed it on, around the 25th of Jan, so theres hope for it, but seeing GoGs turn around... maybe not..

This seems fixed now.

HOLY SHIT, so it does!

Now hopefully they can figure out what's wrong with the giveaway interface on the front page and fix it before the next one.

This seemed fixed as well. Perhaps simultaneously even.