https://forum.game-guru.com/thread/214389
Under the physics section.
Set it to -1 probably.
Reload the map and see if it holds in the properties panel of that object.
RIP
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.
New:
Intel(R) Core(TM) i5-8400 CPU @ 2.81GHz, 12GB RAM, Nvidia gtx660, Windows 10 Home 64bit, Screen resolution 1920 x 1080. System Passmark 3774