A padlock can be the result of several things.

If you have Force Order on, padlocks will appear for any module that is not yet available to the user.

Additionally, if a module has This Item is Mandatory For Course Completion enabled, all following modules will appear locked until a user finishes it.

Lastly, if you have a Module Start Date enabled that is in the future, the padlock, as well as a calendar icon, will appear.

If you look into your settings for your course and/or affected modules, you should be able to identify what is creating the padlock.

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