Handwritten annotations being erased

Hi,

I hope you're well.

I am having issues with my handwritten annotations whereby certain elements are erased after re-opening the document (see attached image).

https://s3.amazonaws.com/zotero.org/images/forums/u15540376/9tdfdg7e7gsmgxc14cpl.png

How do I prevent this from happening in future? I am very new to Zotero.

Thanks,
Daniel
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