Input is not cleared after submitting the Major Project form

After you submit the major project form, all of the input you had in the form remains there, instead of getting cleared as expected.

See screenshot of the form contents immediately after I submitted my major project

首先定位 Major Project 表單及其提交流程，然後透過提交已填入的輸入內容來重現問題。完成標準是：提交成功後表單會被清空，同時提交仍能正常完成。

由索引模型根據 Issue 內容生成。