[Parallex]

When I heard random explosions, the first thing I got on my mind was vehicles. Yes, vehicles as that's the only medium which explodes in GTA San Andreas (other than bombs / weapons and stuff, which has to be done by a player manually). Therefore, as ALiScripter has said before, the vehicles are somehow getting glitched or something and I've seen this multiple times in other servers too where the vehicles get a spawn error and spawn above each other.