It's not your plugins, the above plugin isn't setting the gravity correctly.
Try this:
PHP Code:
#include <amxmodx>
#include <cstrike>
#include <fakemeta>
#include <hamsandwich>
new gCvarGravity[4];
public plugin_init()
{
register_plugin("Team Specific Gravity", "1.0", "Partial Cloning");
gCvarGravity[0] = get_cvar_pointer("sv_gravity");
gCvarGravity[1] = register_cvar("sv_gravity_tt", "400");
gCvarGravity[2] = register_cvar("sv_gravity_ct", "800");
gCvarGravity[3] = register_cvar("sv_gravity_sp", "1900");
RegisterHam(Ham_Spawn, "player", "HamOnPlayerSpawnPost", 1);
}
public HamOnPlayerSpawnPost(id)
{
if(!is_user_alive(id))
return HAM_IGNORED;
set_pev(id, pev_gravity, get_pcvar_float(gCvarGravity[_:cs_get_user_team(id)]) / get_pcvar_float(gCvarGravity[0]));
return HAM_IGNORED;
}