Match Function Returning NA and Incorrect Values

I am extremely confused with what is going on in this file I was using. I understand the match function tells you the relative position of something in some given range, but the values it is giving me here seem totally wild. I get NAs sometimes when I change the text on the left, and other times I just get the wrong position (sometimes the right position). I am honestly beyond confused at this point as to what could possibly be going on (there is no consistency - I presume there must be something modified about the cells that I am not seeing). Please help, I beg.