Fill in your credentials in order to unlock your account. This action will logout all of your open sessions which was opened from any device (phone, tablet, computer etc), and will clear (refresh) all of your session data.
In NIMS application any search is of persistent type. By unlocking your account, your last search items, as well as some settings for pages will be reset to their default value. This is normal/intended behaviour and is happening every time when you login/logut.