Bug Report

Type /ver NametagEdit and post the output.

4.1.7 NametagEdit

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
1.10.2 Spigot

What plugins are you using? Type /plugins
NoCheatPlus, TitleAPI, IPWhitelist, VanishNoPacket, PlaceholderAPI,
DeluxeMenus, PermissionsEx, ConditionalCommands, Swipeo (Custom), ViaVersion, NametagEdit, ViaBackwards, EzQueueSpigot, Multiverse-core

Please explain your issue. How do you trigger it?
If i want to make like a tab prefix MT Staff | NAME it cuts it off!
Its very annoying since other big servers can do this!
So its like MT Staff | lapen and it must me Slapen and not lapen

Are there any errors in the console? Please use: https://pastebin.com
No there are no errors.

This is not a bug. NametagEdit's default functionality utilizes the ScoreboardTeamObjective packets which limit the character length to 16. You are referring to the functionality of PlayerListName, which to my knowledge in 1.8 is permitted to be much longer. This current functionality is actually a remnant of NametagEdits days prior to 1.7, where altering the PlayerListName wouldn't allow for 48 character names (prefix + username + suffix), and result in the name being cut off.

Edit: I'll add this to the TODO in-case to see if we should switch to PlayerListName instead for later versions of MC.