This is a pretty unique issue, so I'll try to explain it best I can:
As some of you may know, one way to access a user's profile is to replace their username with their profile ID (for example, my ID is 205,136, so https://knowyourmeme.com/users/205136 links to my profile). As a moderator, I can see banned/deac'd profiles, meaning that using this method I should never get a 404'd profile unless the profile ID exceeds the existing number of users. However, while doing a site survey, I discovered that profile IDs ranging between 278,144 and 278,437 do not exist. Try it for yourself:
https://knowyourmeme.com/users/278144
https://knowyourmeme.com/users/278437
Any profile IDs within this range (almost 300 profiles) will 404. This is the only gap I've discovered, but I'm sure there are more.
My question is: is this a glitch in the site, or was this gap intentional? According to Asdfghjkl, sequence gaps in URLs are sometimes done on purpose, but if this is an actual issue with the site then I hope it can be solved.
Edit: Holy fuck that was fast, thanks James!