When creating (editing) the form, go to Permissions > Conditions > Dynamic Permissions > and choose Post Author. I believe, this should be the fix for you.
Don´t forget to turn off condition by user/role, or it will overwrite the dynamic post author permission

If you are using Elementor, I recommend to watch this video: https://youtu.be/iHx7krTqRN0?t=739
Hope this help 🙂
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This reply was modified 3 years, 10 months ago by kabuuu.