In C++, arithmetic operators * and / have the same priority and therefore should be resolved left to right. In this case, * is being resolved first and / second.
1/128*128 and (1/128)*128 should produce the same answer, but when applied to a number box in the editor they behave differently. See attached image
This does occur in //UE4/Release-4.24 cl 11590231 so I am not marking this as a regression.
Result
The editor will parse the equation as 0.000067
Expected
The editor will parse the equation as 1.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-96162 in the post.