Extra Pair of Brackets gives different result

I see it now..

Pretty sure it's related to the Floating Point Precision issue (google it)
Basically not all decimal values can be stored precisely in a binary system
The result you see in T41 is a miniscule value less than absolute 0, shown in Scientific notation.
A further calculation of =T41+1 results in 1.

I think the extra () creates an additional calculation step, revealling the FPP issue.