Whenever I add a new layer text, the anchor point is automatically set to the lower left of the layer, and I find it really annoying having to center it each time aswell as it possibly not being perfectly in the centre of the text, also, whenever I create a shape with shift+command it centres around its own anchor point while it used to centre around the anchor point in the middle of the composition. I dont know what I did but this suddenly happened, and I dont know how to change it back 
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Thanks 