Issue: emojjis in Visitor Messages

Been having this for a while now.
When I use any of the forums emojis/smileys in Visitor messages they get changed into: ������ (<--- 1 single emoji gets turned into 6 of these)
When I then edit the VM and remove those question marks and use the same emoji again they don't reappear though.

Wondering if this is a known issue and if there's a way to prevent it?

It's a holdover from the old vBulletin software that causes glitchiness with emoji in quick reply.

Just click on go advanced in VMs when using emoji and they should post as normal