First of all, whenever in a party there is a fairly large portion of the screen where the left click no longer works. It could be an extension of the party buff/debuff window (that is somehow still invisible when instance matching).
Please make the left click go through that piece of interface.
Second issue is with pets. Whenever there is a group with multiple pets it becomes almost impossible to click on actual monsters because the “Talk” balloon from the pets takes priority.
Please either remove the “Talk” balloon when hovering on a pet, or change the pets from NPC type to player type, so that only the right click begins an interaction with them.
Left click does nothing aniway.
Thanks for reading.