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CALC's widget has an automation function for your device's clipboard. It will try and evaluate anything that is currently in memory to save you time. By tapping on the current content of your clipboard in the widget, it will be cleared and ready to punch in your own expressions.
If you'd rather disable this feature you can do so with a simple switch. Expand History first by taping the down arrow next to Evaluate then tap on the switch to turn it off: