'Build docker image with same name

I created a docker image using "docker build ABC:1.0 ."

Following "docker image ls"

REPOSITORY   TAG   IMAGE ID   CREATED      SIZE
ABC          1.0.  exxx12345  35 min ago   4.24 GB

There were some issues with missing directory so I deleted the above using "docker image rmi -f ABC:1.0"

I created another image with same name "docker build ABC:1.0 ."

Following "docker image ls"

REPOSITORY   TAG   IMAGE ID   CREATED      SIZE
ABC          1.0.  exxx12345  36 min ago   4.24 GB

It appears that the previously created image was never deleted looking at the time of creation and IMAGE ID. Please help me understand why docker is behaving like this.



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