Now, they look like blue exclamation marks - sometimes inverted :ole:
I see the 'problem', the 'arrows' are part of an image. I've never known what the 'blob' on the left of the direction column represented - I wondered if they might have been shrunken tag browser category icons

IMO, if they can't be discerned, the
A/
Z and
Z/
A are redundant.
I assume White when Dark and Black when Light would just happen if unicode arrows (u2191 and u2193) were were prepended to the column names --- i.e
Code:
'↑ ' if ascending, '↓ ' if descending, or ' ' if neither
Added: And crop the arrows from the sort_xxxx.png files.
BR