Question about printing multiple objects at once

I have the Hictop Prussa i3 3DP-11 and I am trying to print multiple objects at once and am having issue. I am trying to print a cable chain and printing 12 links at once. Some of the link have bad middles and when I go to remove the links from the table at the end of the print the link will pull apart in the middle and the middle looks like it didn't get as much material. I am not sure what is going on and any help would be appreciated. I am using PLA and printing at 220 extruder temp and no bed temp. I did a temp tower when I started using my roll of filament and 220 looked good.

Is it just the case that I am trying to print to many things at once and by the time it gets back to the first link that it is printing I am not getting good adhesion? If this is the case, what can I do to solve this?

Note, I do not have a cover over my print.