It sounds like you are copying a trailing space, which is not uncommon when copying from a webpage or word document etc.
What I would suggest is if you are doing this regularly is to create a command on the asset page.
Eg I have a button I use which catches the below.
FQDN: PC-00727.DOMAIN.local - IP Address: 10.10.X.XXX
Command Example: cmd.exe /K "set vFQDNandIP=FQDN: {smartname} - IP Address: {ipaddress} & echo %vFQDNandIP%| clip & exit"