have same issue others report. click on a cell and 2 cells highlight.
happens throughout the sheet. usually the target cell and one below it.
have also expericned it highlighting the target and 2 or 3 below it or target
cell and one to the right.

saw this question posted before and someone with a microsoft address saying
that this was a MAC forum. makes no sense why there would be a Mac forum
with a microsoft address.