Why do I need to delete failed Cloudformation stack everytime before running codepipeline again?

[Exter-dg]

I have a codepipeline(v1) created using CDK which has multiple stacks. Lambda, Cognito, etc. I noticed that if the stack fails (Cognito or lambda), I have to go to the cloudformation console and delete the stack manually before rerunning the pipeline. Otherwise the pipeline directly says that the stage failed and I can see no logs of that time in the cloudformation console. The stacks were in rollback completed stage before I deleted them