Hii Shariq!
As we all know, pyramid of energy is always upright, it can't be inverted ever. But, when we talk about an ecological pyramid which is generally inverted, we need to look into various factors that. It depends on the standing crop, standing state, population etc., So, it can be said that pyramid of number or biomass can be found inverted generally because the organisms at higher trophic levels are usually less in no. And have more mass. But, the pyramid can also take different shapes accordingly.
Hope this helps.
Good luck!