some missing gridlines
This is an olf forum but my solution was that I didn't realise that the preceding cell had spaces after the text, that were 'leaking' into the following cell creating the illusion of a missing gridline.
The solution for me was to delete those spaces, or to change the text wrapping so that they were hidden behind the cell/gridline instead of in front of it.
Hope this helps someone looking around for this weirdly specific problem!
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