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There is a known issue with Parallaxis stack with the latest release of Safari.
Nick Cates has left Rapidweaver, @joeworkman has taken over all of Nicks stacks.
Adam @Elixir had graciously put out a fix for the stack in question, but I don’t know if he is still making this available since Joe is now the ”owner” of the stack.
To my knowledge @joeworkman hasn’t yet put out an officially fixed version.
You can turn off the parallax effect until you get a fixed version from either Adam or Joe. You can also check it another browser to make sure it’s the same problem.
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