I'm not sure if this is a MT bug or a problem with the data feed.
To reproduce this bug, make a new entry for a Swiss equity, such as UBSG:VX and use Yahoo Finance as the source.
If you make the entry after the market has closed, only the following fields are written to MT: Last, Chng, Chg%, High, Low, Volume, Prv Cls. If you enter the same ticker during trading hours, all fields will be filled, including Name, 52Lo, 52Hi, MktCap etc.