Disappeared lotties

Hi, I have made a webpage with many interacting lottie animations on it. Some lotties are still visible, but the lotties, which I made by exporting png sequences using Bodymovin have gradually disappeared.
Firstly, I couldn’t see these animations in a published website, but still saw in prieview or working view, later they disappeared in all views, without me making any changes.

Here is my site Read-Only: https://preview.webflow.com/preview/test-a7bf01?utm_medium=preview_link&utm_source=designer&utm_content=test-a7bf01&preview=b1b564a1fceeaf9299edb42ecf80da75&mode=preview

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