Do something like this to find out which events aren't being counted and adjust your matches accordingly | eval browser=case(
searchmatch("*OPR*"),"Opera",
searchmatch("*Edg*"),"Edge",
searchmatch("*Chrome*Mobile*Safari*"),"Chrome",
searchmatch("*firefox*"),"Firefox",
searchmatch("*CriOS*safari"),"Safari")
| where isnull(browser)
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