Blocking a number blocks all numbers

Hi, My girlfriend recently had to block a number on her Android phone but found that doing so actually blocked all her numbers. Are there any known android issues that might cause this? Or is there a way she could accidentally do this without realising? She really needs to be able to block a number but currently can’t as then nobody else is able to ring her. System is Lineage 17.1 (Android 10).
Thank you for any help.

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