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We haven't changed our Dropbox integration. The format of the submission should still in PDF. I tried the integration, it's saving as a PDF. Here's a screenshot:
As you could see, the 357525536622313961.pdf is the copy of the submission in the PDF format. Can you try again?
Please note that the integration cannot convert your file uploads. The file types will remain the same in Dropbox.
Please try to remove the Dropbox integration and do it again. If it still doing the same then I think some app is doing the changes. Please check your connected apps.
Also, in the integration, try to set a submission folder: