Notifications are an excellent way to know what's coming in on your phone, but not so much when it notifies you while you're already using that app. From your description, it would be recommended to contact the app developer via your phone's app store. This will be the best way to notify them of what is not a normal action for any application.
Please use this link for Android phones: https://www.verizonwireless.com/support/knowledge-base-43779/
Please use this link for Apple phones: