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It's probably a race condition; the two events are actually fired simultaneously, but in practice one of them has to be handled before the other since the UI is single-threaded and can only do one thing at a time. It could also be that the events are fired in a different order for different types of instances. Without being able to look at the C code that fires the events, there's no way for us to know which is the case.
Fortunately, we don't need to know -- just use aallkkaa's solution. It will run your "check talents and update frame visibility" function on both events, so it won't matter which order they fire in.
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Retired author of too many addons.
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