Could a moderator help me?... read decription

I don't pretend to deviate with what is related to the context of this forum...

My question is why the page does not allow me to answer questions to old posts, I have taken about 3 attempts to answer questions from 3 years ago and more with extra points but my answer does not load. I do not think it is my mobile since I have deleted all the cookies from my browser and I have tried it from my computer and another mobile with a different browser and it gives the same result. However, the page allows me to answer new questions

Well I would like to know if I am not the only one with that problem and if so I would like you to help me with some solution

thank you for your time