Suggested solution:
1, clear the browser cache.
2. If it is IE, it is recommended to reset the browser, that is, restore the default settings and turn off the monitoring of the browser by Thunder.
To turn off Thunder's monitoring of browsers:
Hold down the ctrl key, and click the "Download" or "OK" button in the library download prompt box to cancel the monitoring function of Thunder/Express software.
In this way, the downloaded format is the correct format.