AhsanAllahu ilayk ustadh i hope its not waswas but due to heat sometimes and/or health issues feces exit and i find after the salah sometimes i have wudu and pray more than 1 salah and find it later. are these prayers valid or should i make them up. what is the asl in this regard

What makes me doubt that you actually have something is that in the beginning you said, "Inshallah, this is not waswas." You should be able to know if it is waswas or not. Therefore, I cannot answer your question because sometimes excessive thoughts can reach the point where you actually see something while you didn't see anything. I have experienced this with more than one brother who said they actually saw something when they didn't. So, excuse me from answering this question.