Laser Glitch

[Byte]

it can happen with the beam as well, hapen to me so many times

Literally impossible. The beam has no collision (both plain and particles), nothing will every interact with them.

As for this bug, its actually just a map bug.
The map is buggy at those points and does exactly what you've stated (its just a coincidence the laser was also used at that time).
Nothing we can do except wait for the map maker to improve/finish the map.