Hi Mateus,
We tried to reproduce the reported issue with the attached sample, but we couldn't able to reproduce the issue.
Can you provide an issue reproducing sample or modify the attached sample to reproduce the reported issue? This will be helpful to reproduce the issue from our end and provide you with a prompt solution.
Also, by default, if the target is not provided, then the FAB will be added with a fixed position in the browser viewport. You don't have to add the page body as a target.
https://blazor.syncfusion.com/documentation/floating-action-button/positions
Regards,
Navin V
Attachment:
SyncfusionBlazorApp_dc48aba2.zip