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[kirakatve]

Hey!

It could be that you didn't get the pipes right. It can lock in place, but if it didn't do the flash, then the pipes are not correct. You can't move the pipes after you've solved the puzzle right. This seems to be the place people get most stuck.

You should be able to pull one of the levers to lower a part of the bridge, and the other half will get stuck, after which you should throw rocks at it to lower the other half.

Usually if something is glitched out we recommend reloading an earlier save, but if you didn't have any of those available, you might have to replay the game - if the tips above don't help.