Trigger not functioning correctly

Hello Heroes, 

I'm using the crossword puzzle template found in the e-learning heros repository. I have to make some changes to make it 508 compliant, and this is where I'm running into an issue. 

Rather than tabbing, I created a text box that the use can enter the entire word in, and it will populate each tile accordingly. Instead, what's happening is the whole word typed in the text box is being inserted into every tile (rather than a single letter). See attached images

My trigger says "Set [tile] to [x] when [textbox] loses focus If [textbox] = value [word]." 

Can anyone help me figure out what I've done wrong? Semi-new to articulate. 

Thanks!