Lines 560 and 562 are inverted in HighLevelElement.py (reference).
According to the documentation itself in line 525, the code for a gaussian distribution is 2 and for exponential is 3, but they are inverted in code.
TL;DR:
Actual code using a gaussian random voltage source showed the bug, by generating only positive voltages, which is true for exponential distribution but false for gaussian distribution.
Lines 560 and 562 are inverted in HighLevelElement.py (reference).
According to the documentation itself in line 525, the code for a gaussian distribution is 2 and for exponential is 3, but they are inverted in code.
TL;DR: Actual code using a gaussian random voltage source showed the bug, by generating only positive voltages, which is true for exponential distribution but false for gaussian distribution.