Losing blocks from pages

Hello,

We have a few pages on our site constructed using SiteOrigin. But every once in a while we seem to be losing the blocks and the page ends up spewing out etc. instead. In admin, the posts switch to classic editor instead of going into the block editor. WordPress prompts to copy the text if we switch to block editor but that seems to do the wrong thing.

Do you have any way of recovering from this state? This has frustrated us for months now.

You can see an example of this at https://146.190.152.150.

Thanks in advance.

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