Well, I spent all day trying to figure it out... Someone from here and the other forum suggest me to go through the doc.xml...
Before I did that , I made a backup on August 25th and August 28th. I add more markers on the 28th and tried to save it and it took longer to save it... I had to escape it..
it could be other reason as I am at home using vpn and maybe it could have led disconnected... don't know. I was away from the laptop for about an hour...
Anyway I spend a lot of time open the second chunk because I remember worked on that chunk... so I open that 2 folder and look through...So I made a copy of that 2 folder to another place and look it through the xml file... save as a new one and then copy and put it the 2 folder...and test it... I also deleted the project.zip and then copied the original project.zip from the 28th and came out fine...
So that is what I did..
It might be nice to have a written set up a code or python file to do that in the future ?