Ok, maybe you need to read this:
https://support.apple.com/guide/disk-utility/partition-a-physical-disk-dskutl14027/mac and
https://support.apple.com/guide/disk-utility/partition-a-physical-disk-dskutl14027/mac and some of the links from inside those articles. Your terminology would seem to indicate that you have four old-style partitions, three of them set up as APFS with a Container and a Volume for that partition, and one set up for HFS+. And now you have on your internal drive a second Volume named "containeroinvert" with one file? Or is it a second "Macintosh HD" with one file of that name? In any case, I would open Disk Utility and see if your internal drive has more than one Volume in the Container, then look at the external drive to see if the partitions each have one Container and one Volume to see if that duplicate Volume is there. If so, follow the instructions from Apple in the articles and linked articles to eliminate the extraneous Volume.
BTW, your division of the drive was not really needed. It would have been easier to have just two partitions with one Container and three Volumes on one partition, then the other partition as HFS+. But in fact, you don't even need the HFS+ on the external unless you want to somehow share the drive physically with another Mac with an older version of the OS. The advantage of APFS and the Container/Volume structure is that volumes are dynamically sized within the Container, so the three drives would size themselves within the Container as they needed to as you added/removed files from the Volume.
APFS is new, and I'm kind of surprised that you could have four partitions, if in fact that is what you have. From reading about it, I would have suspected that converting the drive to APFS would have affected the entire drive and created four Volumes in one Container, but to be honest, I've not played with it enough to know what options exist. I may have to do some experimenting.