Are ranges in VBA not accepting Double declared value?

I have the following code where I pick a value from a named range and store it in a variable declared as a Double. Later on, after changing the variable or not I want to reassign it to the named range. But here I get an Overflow error. The error disappears if I change the variable into an Integer. For information, I am working on a Mac.

'''

Dim maxDepth As Double
i=0

Do Until Range("scopeID").offset(i, 0) = ""
    maxDepth = Range("currentDepth").offset(i, 0)

    ' some code here that possibly changes the value based on some conditions

    Range("currentDepth").offset(i, 0) = maxDepth
    i = i + 1
Loop

'''

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