I can reproduce it in current Chromium. The image loaded as part of the listing does not show the tickmark, while if I right-click on it and "Open image in new tab", I see the tickmarks correctly.
I think this is related to Cookies, and new SameSite policy in Chrome since last year:
This is issue in both Chrome and Project-GC side. You can workaround it in Chrome with these steps:
chrome://flags/ in your address bar, it will open settings.
- Search for “SameSite by default cookies” and choose to “Disable“
- Search for “Cookies without SameSite must be secure” and choose to “Disable“
- Restart Chrome
Note, that this will cause your cookies might not be as safe as before and you might be more vulnerable to CSRF attacks so I do not recommend doing this on your main browser. You can also use different browser such as Firefox, where it works still fine.
The better fix would be if Project-GC would set the cookies needed for rendering these images with SameSite=None. At this moment, all of the cookies are filtered on the requests from geocaching.com and therefore Project-GC can not know if you are logged in or if you are paying member.