Strange CheckBox issue

[hazmat]

I have 2 sheets, Each sheet has a ActiveX Checkbox, and both are linked to to the same cell on sheet2, say A10.
The checkboxes states mirror each other if i check either one, and I can change the value in A10 from true to false, both checkboxes with be unchecked. So far so good.

However, If i put code in the checkbox on sheet1, example below, and change value of A10 from true to false, only the checkbox on Sheet1 gets unchecked.
What's really strange is, if i remove the Else Sheet1.Range("F1").Value = "" part of the code, it works as expected

I tested this on a new, blank workbook to make sure it wasn't something else in my project.
I also tested with both checkboxes on the same sheet, and that works as expected

Thanks for any help

Private Sub CheckBox1_Click()
    If Sheet1.CheckBox1 = True Then
        Sheet1.Range("F1").Value = Sheet1.Range("E1").Value
    Else                                '<---- if this and next line are removed, it works as expected
        Sheet1.Range("F1").Value = ""
    End If
End Sub

 

[RoryA]

I can't replicate that in 365.

Edit: scratch that, was still in design mode. It does do the same in 365.

 

[hazmat]

I can't replicate that in 365.

Edit: scratch that, was still in design mode. It does do the same in 365.

Thanks for confirming it wasn’t just me

My work around is: Instead of changing the linked cell to control both checkboxes, I am now directly changing the state of one of the checkboxes, which changes the linked cell value, which changes the state of the other checkbox