Type /ver NametagEdit and post the output.

4.4.6

Please explain your issue. How do you trigger it?

For some reason the tag above someones head is overlapping their name.

Are there any errors in the console? Please use: https://pastebin.com

No errors in console

I have also already enabled longtags

http://prntscr.com/rr6162

Full IGN is Erick, not rick

I have the same problem.
With some users the first letter disappears and with others the last character of the suffix disappears. I also noticed that for some users spaces from the prefix and/or suffix disappear. :C

How to fix:
build from source the version 4.4.8 and it works!

As stated in the readme:

Q: My nametag is cut short, even with LongTags enabled!

A: LongTags is only able to disable a longer nametag in the tablist. The name above your head has a different limit (16 characters for prefix and suffix.) We are unable to change this, as this limit is imposed by Mojang.