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This appears to be coming from the Editor > Syntax Coloring > Syntax Formatting preference, for the Django Template file type. From playing with it, it was the asp_python_default, asp_python_word, and asp_python_identifier lexer states, but all of the asp_python_* ones seem to be using that background.
These defaults seem like they are designed more for light background display themes. Also, I'm not sure why the lexer states listed in the preference are not properly alphabetized. We'll try to improve this in the future.