On a few occasions, I have denied new settlers, when ever I have done this the new settler window comes back up again now with the count of settlers set to zero and it does not accept the denied button only confirms and then it keeps popping up for about 3-4 times of click the only option its response to (Confirm) before it finally goes away.
While I don’t think it causes any actual harm it sure is annoying and feels buggy. Sadly I have not been able to video this.
Currently playing on v.0.8.3b