Erhsavas

I installed safekids to my son's android tablet. (Samsung SM-T510) i closed and restricted some apps via safekids but everything was ok for a while but my son discovered something and succeeded to hack the safekids. First he broke the connection between mykaspersky and safekids in the tablet computer. Then I made the settings again but after that he removed the safe kids from tablet without username and password lock. I dont know how he could do this. I asked how you did he said that while trying to open a forbidden or restricted app, if try many times to open the app after a while safekids become confused and opens the forbidden or restricted apps. What is the solution for this reason? If safe kids can be hacked easily via such methods how can I trust your safe kids app?