Thank you for your reply.
1) I am using 2 matchdays. They don’t have similar no of matches. I am not been able to add matches in any of them. However, if i create a new matchday, new matches are adding without any problem.
2) I have not installed any new plugins in recent days
3) I dont know about this issue.
Actually, when i create a new match and click Add new, it is adding. But if i click on Update, the match is not updating and not saved.