Deficiency, Excess, or Change in Leading Prayer
Scholars have said that seeing a deficiency, excess, or change in leading prayer may indicate injustice in leadership and exposure to poverty or calamities. Leading them standing while they are sitting suggests not neglecting their rights while they neglect his, or his care for the sick. Leading them sitting while they are standing indicates his negligence in a matter he undertakes. If he leads a group standing and another sitting, he will manage the affairs of both rich and poor. If he leads them sitting while they are also sitting, they may be afflicted by drowning, theft of clothes, or poverty.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam