I am seeing issues with the calendar search using ITA Matrix. It does not return accurate results (very high fares). No date ranges of fares for each potential departure date. Only results for the maximum value in the day range. When you select a departure date, accurate fares are returned.

Is anyone else seeing this? I have been able to reproduce this behavior on different laptops (1 WIndows and 1 Linux) and using different browsers (Chrome, Firefox and Chromium).

Update:

Strike Firefox off the browser list. I thought I had used it but on retesting, it works with Firefox. Also works on MS Edge under WIndows 10. So maybe something to do with the underlying Chrome engine.