Numbers crashes when I enter text into a cell

[oregonduck]

I am having a very perplexing problem. In a specific column of my data, any time I type "na" it crashes Numbers. It can be any cell in the column. I haven't been able to reproduce this with any other sequence of characters. What the hell is going on? Thanks!

 

[dyt1983]

edit: to remove personally identifying information not relevant to the thread.