I am often moving tasks between projects. To do this I double-click the task, then start typing the name of the project. Sometimes, the task inspector somehow removes the first letter of the project name I started typing.
The steps to reproduce this are: double-click task, double-click project name so as to select whole word (or triple-click if project name had blank spaces in it), start typing. Voilà: 1st letter disappears and 2nd, 3rd letter etc. are used for matching project names.
This does not happen when I use the little x element (located at the right side of the project name field) to first erase the project name and then start typing.