I will redirect this topic to the developers and they will check.
We checked the errors you shared to this topic and want to say that there is no issue at this moment, there are dozen HTML code checkers around the web and they can show different results.
Our theme was checked by the WordPress professionals several times and it was validated as the WordPress standards coded theme, so there are no troubles with the theme.
If you will have any kind of issue during the theme use, please feel free to contact us any time.
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