[Therion] Strange Ghosting

When I open a .top file on a pc I sometimes get the following result. Lots of ghost shots and splays in yellow. Can anybody explain? Is it a pc thing? All the data from the yellow lines is showing in the data view and can be deleted. The files go into Therion OK with no yellow lines to be seen so this is not really a problem I'd just like to know what's going on. Thanks, Nick Bairstow [cid:image001.jpg@01CF7BFD.1EA42550]