double eval, loudness jumps

[felixroos]

i've noticed with multiple people using strudel, it can happen that suddenly the loudness seems to double..
i assume it's some evaluation timing problem, where there's a small chance for a pane to be evaluated twice.
I'm not sure if this problem is strudel only + fwiw i think it only started to appear recently, at least i haven't noticed before.

here's an example of what i mean:
https://youtu.be/jdFSmr3koXg?si=pbSBBUUNYe6IxFLx&t=3470

the evaluation at 57:52 in the bottom left pane suddenly doubles the pattern for that pane.
it might or might not be coincidence, but the pane on the top left is also evaluating at a similar point in time, also creating a flash glitch for the bottom left ( #296 ).

edit: it should be noted that the doubling vanishes on the next evaluation