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# ask-questionsw
worried-planet-2191
07/31/2023, 9:12 AMThis message was deleted.
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white-fireman-22476
07/31/2023, 9:49 AMHi Tom. Did you change the split percentage at any point?
white-fireman-22476
07/31/2023, 9:52 AMI'm not yet up to speed on how GA assigns the client ID, but is there a chance that the same user_id could be on two different client ID's? Like if they log in on the web, and again on the phone?
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billowy-lizard-55653
07/31/2023, 10:15 AMHi James, the split is the default 50/50 and has not been changed. But I see what you mean about assigning the ID. This site has no logged in users so, so I don't necessarily see how a user on multiple devices could be identified as the same user _id - maybe if they log in on web and mobile with both logged into the same google account? But I definitely see what you are getting at.
billowy-lizard-55653
07/31/2023, 10:16 AMIn the metrics queries, is it possible to query by clientId to avoid this sort of issue?
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white-fireman-22476
07/31/2023, 10:26 AMIf the multiple exposures is due to a non one-to-one mapping between user_id and clientId then I would expect it might help or anonymous_id and ClientId. But it is also possible that there is something else going on too, like maybe the clientId is not loaded by the time the event is happening or something. At any rate, yes you can try making queries by clientId. If you send the clientId with the event tracking data then perhaps it is in the same table. Otherwise you can specify the identifier types on the data source pages, and create a join tables query to read the one identifier from the other.
white-fireman-22476
07/31/2023, 10:26 AMYou can also perhaps query your data in your datawarehouse directly to see if there are indeed multiple values for a single clientId.
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billowy-lizard-55653
07/31/2023, 10:36 AMThanks for your help James, that all makes sense - I will investigate further.
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