Go to your settings-security-trusted credentials and clear that out. You may have to also go to Phone Administrator in Settings and temp deselect any apps that require PA permissions. Then go to your lockscreen settings and change the type of lockscreen, then go back and reselect the PA permissions for those apps.
Screen lock is a nice feature but it would be nicer to make it more convenient for your needs. Just to make sure, what make and model is your Android?
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