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Thing with the stretta pulleys is that only the lower, twin, pulleys' marks bear ony relevance now. The marks on the cam pulleys are for the pulley assembly only. To align the pulley and back plate to a "safe" setting.
When the belts are changed "by the book" if you like, the cam timings should be reset. This is done by undoing the vernier pulleys, and fixing the camshafts with a couple of setting tools using the T slots in the shafts themselves. The belts are then fitted and the pulleys can be moved to aid this. The belts are then tensioned to a "hot" setting and the verniers fixed. Once that's done, the belts are tensioned cold and job done.
What could've happened in your case is that the setting procedure has been done prior and the markings have been moved. If you've aligned them on the belt change, then you could concievably be one or maybe 2 teeth out??
At tickover, maybe the valves were kissing the piston a little. Once hot and the revs lifted then bang......
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