Drop in sessions after changing cookie consent banner

Topic summary

Multiple Shopify store owners report a significant drop in visitor and session counts (around 40%) after switching from Ultimate GDPR EU Cookie Bar to Pandectes cookie consent banner to implement Google Consent Mode V2.

Key findings:

  • Initial investigation suggested the old app may have been duplicating session counts
  • One user discovered that clicking the “X” (close button) instead of accepting/declining cookies resulted in sessions not being recorded
  • Removing the “X” option temporarily restored traffic levels to normal

Ongoing concerns:

  • The traffic increase after removing the “X” appears largely as “unattributed” or “unassigned” traffic in Shopify and Google Analytics
  • This unassigned traffic shows near 100% bounce rates, suggesting potential bot activity
  • Store owners now face uncertainty about data accuracy and year-over-year comparisons

Current status:
The issue remains unresolved with conflicting data quality concerns. One participant mentions switching to Ketch as an alternative solution with better results.

Summarized with AI on October 27. AI used: claude-sonnet-4-5-20250929.

but the selection shouldn’t make a difference to total sessions/users as this should be recorded before consent, this should just impact tracking downstream and things like geo location, gender etc (is my understanding). Would be interested to see if it makes a difference though!