Date fields not populating from forms

Hi there, it seem of late that our birthday field keeps disappearing - even old contacts that were populated and fixed have disappeared. And as of today When I have tried to manually input the birthday after pressing save a totally different date appears. has anyone else experienced this? Even forms that have been completed in the last couple of days have not dates populating into IS and KEAP. I have also just noticed that we do not have access to support again and my user record keeps disappearing. What is happening here???