The result of driver.page_source get isn't the same as dev tools show

when i switch native page to webview, got the page source of current, but it’s totally different with the dev tools gots. just like this:first is dev tools view, second is page source result.
%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20191023173202
%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20191023173251
anyone met the same case before or knew why?

thanks in advance!