1) When a user quotes you, the link to their profile still uses capitalisation and usernames with spaces in should be replaced with "-" but it comes up as "%20". Leads to an error page.
Broken - https://www.fakku.net/users/Drifter995
Works - https://www.fakku.net/users/drifter995
Broken - https://www.fakku.net/users/Gravity%20cat
Works - https://www.fakku.net/users/gravity-cat
2) Some profiles have numbers in the URL when they probably shouldn't.
3) When people with said "numbered" profiles quote you, the numbers aren't included in the link in Notifications.
Broken - https://www.fakku.net/users/KittyKawaii
Broken - https://www.fakku.net/users/kittykawaii
Works - https://www.fakku.net/users/kittykawaii-7351483