Anchors and spawnpoints

That formula for RND is wrong. Values 2,3,4 will appear more often than 1 and 5. Sometimes no pedestrians will be spawned, or several pedestrians can be spawned at the same time.

If you need to spawn 1 pedestrian every 1 second, instead of RND use "System Pick random instance" event.

So remove "RND=1" condition, add a sub-event under event #7 and put "System Pick random Spawners" there.

If this doesn't fix the issue, the problem may be with two other conditions - Spawners overlapping sidewalk, and Spawners is on-screen. You can try to debug it. For example, in event 6 set Spawners opacity to 50. In event 7 set their opacity to 100. You should be able to see which spanwers are picked by event 7 (overlapping sidewalk and on-screen), they will have 100% opacity.

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since the random range is 1 to 5 and then rounded, you will get the following results:

1 to 1.49 = 1

1.5 to 2.49 = 2

2.5 to 3.49 = 3

3.5 to 4.49 = 4

4.5 to 5 = 5

so, 1 and 5 have half the chance to be picked as 2, 3 and 4

you should use: choose(1,2,3,4,5)

or use floor or ceil to make sure everything is rounded the same way to make the chances equal.

... or floor(random(1,6)) or int(random(5)+1)