Strange (possibility encoded) values in the tracking code report

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brianb60338381

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brianb60338381

brianb60338381

16-11-2020

Hi,

We are seeing a too high to be ignored number of tracking codes in our reports. 

They look like this

cgc_fzbvy_A6G5EVadvefagEbvffeDbaavezbgvba_bayvafufyc

cgc_fzbvy_DbclBaCvyyEfdhffg_ivfjbhecvyyfkcybvafeufef

cgc_fzbvy_DhfgbzfeZvfffeBccbvagzfagEfzvaefe_yvifdubg

cgc_fzbvy_BeefeDbaavezbgvba_ivfjbhecvyyfkcybvafeufef


They follow the same format and structure (pattern of characters groups) as our correct tracking codes send via an internal email server. But appear to have a very simple 
character substitution applied b=a, t=g, e=f, m=z etc


All instances are from desktops and versions of chrome browsers. 


Does anybody know of a Chrome extension which can encode querystring values in this way? or any other possible  cause of this?


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