Dice not rolling properly

For some reason or another, in one of my games the dice rolling and general chat functions have just broken completely.  Last week nothing showed up in the chat at all, and this week typing anything into chat runs one of the player's macros.  The same macro each time. Also, it's JUST  this game.  It's not any of my other Roll20 games.  What's going on?

Try clearing the chat archive from the campaign settings page.

As SkyCaptain says a game's Creator is often able to fix issues with their Text Chat by clearing the Chat Archive (note: not clearing your current Chat Log ). A GM might want to copy/back up the Chat Archive before the Creator clears it.