Loading missing bars in MT4 correctly

 

Hi all, my broker's server gives me market data for limited time(9:00 to 23:00) in 15 minutes chart. Now I have data to fill the gaps(23:15 to 8:45) but when I load this data in history center through import, and if I open chart again and refresh it it'll only show the data I inserted but not the actual server data(9:00 to 23:00) but in history center that bars are also available. So why that bars are not loading in chart?


P.S> My indicator works better if data is continuous that's why I need to fill the missing bars every day. SO please let me know if I'm making some common mistake.


Edit 1: I checked history center again and I can see that the bars from borkers server are missing but the bar count is showing correct number. Any idea why the existing bars got deleted when I added new bars?


Edit 2: So my main question is how to import data in MT4 without deleting existing history?

Reason: