Not an answer to your question per se, but I do have a remark on the form.
I'd be irritated if I would have to fill in this form.
Why? Because there seems to be no way to stay with the keyboard to work your way through the form. After each box you have to grab the mouse to go to the next one. On a userform you could use the tab key, in normal cells you could just use the arrow keys (or if the sheet is protected, the tab key). I would have sticked with Data Validation to create the input fields, rather than ActiveX controls.