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I've noticed that too. It won't have that problem if you attach a timer script instead, but you can only have four timers running at once.

Another thing you could do is add a loop like this:

Just replace 69 with the number of frames you wish to pass until the next part of the script runs (1 second is around 60 frames).

Here's another idea. This might be the best one yet.

The current GB Studio version has a "Script Lock" event that pauses everything except projectile motion and sprite animation. If you place that before your dialogue event, you won't have to worry about bullets firing too soon!