This is not necessarily unusual behavior, but since most people are prone to exaggerate, it is hard to decipher the truth from perhaps fiction in what you report in your scenario. And, contrary to your personal, less than knowledgeable opinion, proxies do and can be good one minute and not the next for a variety of reasons. They can be anonymous one minute and transparent the next, etc., etc., etc.
Arguably it is always best to use one very reliable proxyjudge to test your entire list when possible. If your results seem strange, in any way, retest with a different judge. And yes, a azenv 1.04 judge would be preferred over all others.
No proxy should be discarded without testing it at least three times. However, when you check them again, do so with a different judge. As stated previously, proxies can be good one minute and not the next and vice versa. There can be many factors which cause this. Try to keep in mind that you most likely are not the only person in the "world" trying to test or even use the proxy or proxies in question. It could also be that whomever owns the proxy server could be working on it, maybe it doesn't operate 24/7/365. Surely you can think of many reasons why a perfectly good, anonymous proxy might not be functional at any given time?
Not having the actual list you tested to produced your reported results with is a handicap in answering at least some of your questions. It could offer some additional explanations. For example, if you had numerous multiple gateway proxies in your list and the base (main) server went down for some reason, all those gateways would most likely go down also. It is also common place these days for some to post lists containing the same IP Address available with multiple ports.
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