History file help please

 
I have compiled some 1 minute historical data for import into MT4 in CSV. format. According to MT4 it can handle CSV, HST. files among a few others.
However something is happening on import that changes all the Open, High, Low, Close levels to one single mean 'tick' and the minute candles which were running sequentially are suddenly skipping gaps of up to 20 minutes even though all the information is in the original file.
I have data that is about 250,000 1 minute candles back to January but then on import 'abbreviates' it to 60,000, full of time gaps and only single dot data.
Please, do not suggest Alpari data in your reply, thanks. It is corrupt and full of mistakes, hence why I am have compiled my own broker data.
Thanks people
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