The result page of https://scan.nextcloud.com contains two links to share the result on Twitter or Facebook.
However - the images seem to be missing:
https://scan.nextcloud.com/results/img/tweet-button.png
https://scan.nextcloud.com/results/img/facebook-button.png
The problem is how the images are referenced:
<img src="./img/tweet-button.png" width="100px" height="41px">
<img src="./img/facebook-button.png" width="100px" height="41px">
This is not correct. It should be
<img src="/img/tweet-button.png" width="100px" height="41px">
<img src="/img/facebook-button.png" width="100px" height="41px">