This is TzPivots bug which I found in my MT5.
The real value for Support Line 1 (S1) is 1.5478 ,,,, but when mouse move slightly below/upper S1, it showing 1.5476 or any other value (it should be showing same 1.5478)......
and this is what I mean about 'unstable value',,,, so maybe TzPivots...