Active Armor fails to save settings

For a long time, I used "Unknown callers" -> "Voicemail" settings. But a month ago Active Armor start randomly switching it back to default "Allow", rest of the settings are kept intact. I switched it to "Voicemail" mutiple times (and waited to contacts to be uploaded). But in a couple of days, it turns the settings back to default.

It looks like a bug. Where I can file a defect for the app?