Cell formatting --- numbers

Occasional Visitor

Running Excel for Mac v 16.16.7 on a Mac Pro & OSX High Sierra.  I understand how to Format Cells & Numbers but cannot fix this one annoying problem.  No matter what Format I apply to a cell, if I enter a multi-digit number that ends in “8”, Excel automatically converts the “8” to a “0”.  This is driving me nuts! Any suggestions will be appreciated. 

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