@Chloe Hall, Thanks for posting in Q&A. For your issue, it can be that the user is added into local administrators group when enroll into Intune. You can choose one affected device to check on this.
To fix this, we can configure "Local user group membership and choose Add (Replace): to only keep the account you want in the local administrators group or choose Remove (Update): to remove the user you don't want to remove the standard users from local administrators group.
In addition, Autopilot method can set enrolled user as standard user by setting "User account type" for new devices to enroll into Intune, you can consider using Autopilot enrollment method to enroll into Intune.
https://learn.microsoft.com/en-us/autopilot/profiles
Hope the above information can help.
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