I’m using Yii version 2.0.6, advanced template. I got several notification from the log that someone using my app has got ‘Unable to verify your data submission’. The problem is, I myself can’t reproduce the problem, and the problem only occur several times, while most of the users don’t get this problem. Here are some logs for the problem :
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pastebin. com/98BN9jkS 
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pastebin. com/h1CcgdEu 
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pastebin. com/qSQa4RrE 
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pastebin. com/Zhp0jmNX 
I am using adcanced template with backend and frontend in the same domain. Here are my config file :
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Backend config : pastebin. com/gpXJ5qAV 
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Frontend config : pastebin. com/ZHgdr5P4 
I also already using <?= Html::csrfMetaTags() ?> in my layout. This the <head> section of my layout : pastebin. com/4N6z84aN
What might be the problem?
Also, I’m sorry for the links. This is my first post on the forum, and I can’t embed links in my post yet, so I separate each links with a space.
Thank you.