For some reason, your system isn't recognizing that the : d should be a : D, and I have no clue why that would be.
But, it has to be on your end, because if it was TFL and not working for you, it would be borked for everyone...
You can get around it by typing in the characters directly for now...
: ) (no space between the two) is
: D is
: p is
Is it doing it with any of the others?