EB asks to login before reading complete entries falsely

Dear support team,

I have just tested the function "ask to login before reading complete entries" and an issue occurred:

1. When the function is disabled, EB still asks to login, BUT only in the case of 2 out of the 4 blog entries.
2. When the function is enabled, EB still asks to login, EVEN if the user is already logged in, BUT only in the case of the 2 certain entries.

Could you please help me to fix this issue?

Thanks and Regards

Chris