u/Unlikely-Kick-9697

So I've been working on hm on te awaroa for 6 months off and on. I have all exterior zones shot down and one 1 solo male that isn't shot down. I know I'm not missing any zones as I've ran everywhere shooting the solos down. I ended up stacking 12 level 5s before I decided to call my hm good because I wasn't spawning anymore low levels. And now that I have shot my level 5s off the map they have been slowly respawning as small level 3s (153 or lower on the high estimate). Should i shoot those or leave them because i only have about 6 shooters left. What is going on and how can I fix it? Thanks in advance