It has been brought to our attention there is an issue for the Hero selection on Dota 2 when using a Wooting regardless of what mode, this is caused by Steam, there is currently a workaround.
Setting a launch parameter for Steam
Step 1: Right click Dota 2 in Steam
Step 2: Click "set launch options"
Step 3: Enter "-nojoy"
Step 4: Keep on gaming!
Or you can watch this GIF
Thanks to /u/Perkelton for this fix and his or her Reddit thread here.