VB Editor keeps opening everytime i click macro button

I have been using this code for a while and it hasn't changed however suddenly it has started opening the vbeditor each time i click the button and highlights the Show

Step 1:
CLICK BUtton3_Click() VB EDITOR OPENS

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Step 2: UserForm1 opens which as 2 fields in it Stone & Lbs and save button. Code for button below:

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