Data import not working correctly

So, I import .csv data files to get charts in Amibroker, been working fine for years, and suddenly a few days ago there was some glitch that happened when importing data and things slowed waaaaayyyy down to a crawl and took forever to import. Now, the .csv files are importing at normal speed again but they look like this when I view the chart - candles are all messed up-

How can I fix this? I know this isn't much data to go on but I don't know what else to say. One day charts looked fine and everything working great, next day charts look all messed up. I did not change anything, using the same settings in the ASCII importer definitions as before.
Thank you for you help.

How could anyone test it without attaching the file you have problem with ? Please follow this advice: How to ask a good question

Most probable culprit is the content of data file. Check the file.