Enter the answer and submit, but still get an error

[thunder-gzy]

Describe the bug

课程：雅思小作文50句 => 01-10句v

Reproduction

No response

Validations

• [X] Read the Contributing Guidelines.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] The provided reproduction is a minimal reproducible example of the bug.