Review Detail of Soul841 in MMORPG: Rebirth of the Legendary Guardian

I like the world and the characters are okay in my opinion and I would of kept reading but I don't understand what happened. I was reading like usual and after I was done with a chapter I closed the app. I came on later and it said the chapter was locked even though before I closed the app it was all there. I was looking back through and almost all the chapter I read are locked. I wouldn't have been able to get to chapter 100 I think now. Not sure what happened, but if someone could explain what happened, that would be great.