If you edit a plugin via the Plugin Manager, one of the fields is "Execution Order" - by default, every plugin has the value 5 in this field. By changing that value you can change the order that plugins on a particular hook are run.
The Members in Flashchat, Members who have Visited (and Members who have Posted) mods all use the forumhome_start hook, so to control what order they run (and hence appear) you need to set a different value for each one.
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