Tiktoks I watch suddenly in low quality

Since yesterday when I watch tiktoks, they're all in low quality. I have a galaxy s26 ultra. I don't have any battery saving activated or something. Reinstalled the app but didn't fix it. My youtube or Instagram videos are all in high quality so nothing wrong with my WiFi or 5G.

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I checked on my old phone, a galaxy s21. And there are the videos in normal high quality.

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Any idea how to fix this?