I’ve been trying to save my game when I’m done for a bit, but when I come back, most of it is undone. However, some of it stays, like added or removed props, not devices or wires. Any clues why? 
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Been having the same glitch. Usually happens to me because I’m copying several things at once. Adding your props separately may fix this.
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Check your internet, sometimes when you log off with bad internet, weird glitches can happen to ur game.
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Adding on to what previous posts has said, make sure to save your game often to prevent connection glitches, especially before you close out the game.
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