I'm not an expert but have also just worked thru some similar issues with an aero cloner. What I have found is that it not only needs to be set up sterile, but also KEPT sterile though the whole process by regularly adding something like bleach to the water in order to keep the nasties away. Some people will not have any probs (particularly those who use chlorinated water). But even then it can go bad after a few days if just left to luck.
Best advise I can give is set the cloner up with about 4ppm bleach in the water, using pool test strips to gauge this. Add the bleach at this rate immediately before you put the clones in, and then repeat at 3-4 day intervels.
Based on what I know now, and looking at your pics, if I were you I would either start a fresh batch set as above, or cut the ends off your clones and start them again as above. Because experience has shown me that often when clones scunge up like that the ends get a bit compromised so that they either don't succeed, or take massive amount of time to get roots on them.
This article proved to be the magic bullet for me:
https://www.permaclone.com/blogs/news/the-3-reasons-clones-fail
Good luck! I know how frustrating it can be to have these sorts of issues,.....especially if you have had initial trouble free runs!