My photo gallery changed the dates of some pictures i saved from twitter

This only happened recently. I saved a couple of pics from twitter and when I was looking for it in my recents it wasn't there. So i scrolled up to the end and saw my recently saved pictures from twitter with a date of Jan 1 1970 8:00 AM. My system's date is correct and this kind of thing only happened for Twitter. I want to change it but idk how? please help me!

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