Thanks for the tip Asmodannt ! It was driving me crazy :P
(by the way, if you see this Danik =) the double-clicking to select the tile seems kinda redundant because the "tile placer tool" is made for that, and it seems to trigger a lot by accident when moving your selection and then clicking an empty space to deselect it.
Also, when you double click a really big tile (1000x1000) the process is pretty lengthy and a slight 3 sec. hiccup occurs on my computer when I deselect it.
Anyway Thanks again for being awesome and listening to the community =D )