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Hi @Meigo, that extra data usage is generally made up all the other data usage sources that aren't large enough to be included in the main data usage categories. If you have donated any data, it will also appear in the other usage category.
For more info, I recommend checking out our Understanding & managing your data usage guide.
If you do have any other questions regarding your data usage, we'd be happy to help out. We would just need you to send us a message via the My Optus App so we can securely verify your account details.
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I do see where you're coming from @Meigo. I recommend sending us a message via the My Optus App so we can verify your details and look into the data breakdown for you. We're unable to do this through Yes Crowd as it's a public forum. Jack
Did we answer your question? Please mark it as a Accepted Solution and if you see something that was helpful to you or the rest of the community, giving a Kudos is only a click away.