a bit late here but- there is a pretty simple fix for this. You need to edit the event type for ua-browser-safari so that it looks like the following:
(useragent="* Safari/*" AND useragent!="* Chrome/*") OR (useragent="Safari/*" AND useragent!="* Chrome/*") OR (useragent="*+Safari/*" AND useragent!="*+Chrome/*")
you can then create a new one called ua-browser-chrome whick looks like:
useragent="* Chrome/*" OR useragent="*+Chrome*"
hope this helps anyone else who searches and finds this answer
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