BillboardGUI sized itself at (0,0),(0,0)

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I was trying to make a HP Ui that appear on top of the player and easy to see or read. After I added BillboardGUI into one, it’s size already at (0,0),(0,0). So I’m trying to Resize it back still nothing. https://files.catbox.moe/cd7p4g.mp4 I’ve been facing this problem for months and I’m wondering why does it only happen to me. Please help me https://files.catbox.moe/cd7p4g.mp4