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the number of pages viewed and the images savedDo you mean that they're requesting images separate from the pages they belong to?
how could one analytics app catch it, but no record on the server or the other analytics app?I don't know how clicky works, but piwik/matomo is primarily javascript-based. The visitor has to request the analytics file--or at least its <noscript> minimalist analogue--in the same way they have to request images and stylesheets. Robots almost never request analytics: after all, they rarely even request non-pages. Or, conversely, they request only the analytics file, intending to make you think they have visited, as in one form of referer spam. The latter is most common in third-party analytics such as GA, which isn't subject to sites' individual access controls.