With the basis protection the phone will stop charging at 100% and if it's still plugged in, the phone will be allowed to discharge to 95% and then it will charge itself back up to 100%. Maybe you have been checking the battery% when the phone has been fully charged and is in the discharge cycle dropping back to 95%.
I've changed the battery protection from machining to basic and then fully charged my phone today, it's reached fully charged and showing 100%. I'll leave it plugged in to see if it drops to 95% and then start to recharge back to 100%.