Hi — happy to know you’re interested in the tutorial :)

What could be happening is that you are instantly placing the “phantom” building a first time when you click on the building,

• either because you are checking for clicks “too soon” (for example on the GetMouseButtonDown() instead of GetMouseButtonUp())
• or perhaps because you are not properly blocking the UI clicks (with the EventSystem.current.IsPointerOverGameObject())?

This second point is explained in more details in the 2nd tutorial (https://medium.com/codex/making-a-rts-game-2-adding-a-very-basic-ui-unity-c-8420480afda0), or you can also check out the code on Github directly if you want… it’s evolved quite a lot since the first tutorial, but this part of the logic is still pretty similar ;)

GitHub - MinaPecheux/UnityTutorials-RTS: The code for my series of tutorials on how to make a…

Hope it helps, cheers! :)