Smilies in Chat - too small, bunched up, many are "undefined"

The smilies in chat appear bunched up on my computer and on another member's phone, (see screenshot) and many of them, when selected, say "undefined" (see screenshot).

How could I implement other smilies for this chat room - animated would be best if at all possible.

Also, many of my chatters are seniors. I have enlarged the font for them but the smilies are so tiny we can't tell what they are. How do I make them bigger?

Thank you.