Animating character

Hello guys agar kissi ko bhi answer pata ho to please reply karna:-
Mene ek character ko animate kiya animation tab me Jake phir dopesheet ko Action me change Kiya aur key frames deke usko animate kiya uske bad usko mene render kiya to ye wala tho sahi play ho raha tha magar jab mene uski blender file me usi character ke key frames delete karke new key frames diye aur phir jab isko render kar raha hu to ye pahle Wale animation ko hi render kar raha hai naye Wale ko nahi jese hi render per click karke render animation karta hu wo pahle Wale frames ko hi render karna chalu kar deta hai jise mene delete kar diya hai uske baad bhi magar naye Wale ko render nahi kar raha hai jab me layout me play karta hu to Naya wala hi animation play hota hai magar render per click karte hi purane frames ko render kar raha hai

Agar kissi ko pata hai ki ye problem kyu h arahi hai ti please reply Karo :pray::pray::pray::pray::pray: