Docker images list 2 images with identical REPOSITORY, TAG, IMAGE ID, CREATED, SIZE- why?

General
1

Hi All:

Newish to Docker.
CentOS Linux release 7.7.1908 (Core)
Docker version 19.03.8, build afacb8b

Running a Snipe-IT container.

Whenever i run:
docker images

I get 2 identical results:
[root@hostname]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
snipe/snipe-it latest 81cfb0c6e2ae 3 months ago 645MB
snipe/snipe-it latest 81cfb0c6e2ae 3 months ago 645MB
hello-world latest bf756fb1ae65 6 months ago 13.3kB
centos latest 0f3e07c0138f 9 months ago 220MB

Why are the first two images entirely identical in every category? Are they different? Same? How can I determine this? Which one is my active container using? How can I determine that?

[root@hostname]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b7a84163b51e snipe/snipe-it “/startup.sh” 7 weeks ago Up 47 minutes 443/tcp, 0.0.0.0:8082->80/tcp snipeit

Thanks!
-lerroot

3

well i ran
docker images prune -a
after firing up all my containers.

this worked:
[root@hostname/]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
snipe/snipe-it latest 81cfb0c6e2ae 3 months ago 645MB
centos latest 0f3e07c0138f 9 months ago 220MB

***BUT isn’t there a better way? Thanks for any input.

Yours,
lerroot