Oh well I guess that concludes it then. Thanks a lot for your help Urgrain :)

I will reply to this thread once more when I found the conflicting addon to prevent others from having this

Yes did that, it worked, but I'm now looking for conflicting addons, have tried a lot and don't feel like going through them all, I mean I already deleted half. Are there any confirmed conflicting addons?

Server.cfg:

hostname			Pichu's Homebrew Server
sv_defaultgamemode		sandbox
sv_scriptenforcer		0
sv_lan				0
maxplayers			8
mp_falldamage 			1
cswep_gradualaccel_global_cl 	0
sbox_maxwire_thrusters 		50
sbox_maxnpcs 			20
sbox_godmode			0

gmod_cvars_sv.txt

"CVars"
{
	"gmod_physiterations"		"4"
	"Serialiser_SaveCompressed"		"0"
	"gmod_datastream_iterations"		"1"
	"pac_enable"		"1"
	"pac_allowbonescaling"		"1"
	"pac_maxbonescale"		"1.500000"
	"pac_maxparts"		"100"
	"pac_maxpartscale"		"2"
	"pac_maxoffsetdistance"		"100"
	"pac_maxlights"		"2"
	"pac_maxlightbrightness"		"1"
	"pac_maxlightsize"		"256"
	"pac_maxeffects"		"20"
	"pac_maxsprites"		"20"
	"pac_maxspritescale"		"2"
	"pac_maxsunbeams"		"5"
	"pac_maxsunbeampower"		"0.300000"
	"pac_maxsunbeamsize"		"1"
	"pac_maxsunbeamdistance"		"512"
	"pac_maxtrails"		"20"
	"pac_maxtrailscale"		"2"
	"pac_maxtrailfadetime"		"5"
	"pac_submission_interval"		"5"
	"sbox_maxwaterizer"		"10"
	"sv_AdvDupeEnablePublicFolder"		"1"
	"AdvDupe_NoItems"		"1"
	"TheFalcoThirdPersonValue"		"0"
	"sv_HoverDriveUseEnergy"		"0"
	"durgz_witty_sayings"		"1"
	"durgz_roleplay"		"0"
	"pac_server_outfits"		"1"
	"cswep_snapsallowed"		"1"
	"cswep_gradualaccel"		"1"
	"cswep_gradualaccel_global"		"0"
	"cswep_def_walkspeed"		"140"
	"cswep_def_runspeed"		"310"
	"cswep_roll_dmgdec"		"0.5"
	"fretta_voting"		"1"
	"fretta_votesneeded"		"0.7"
	"fretta_votetime"		"20"
	"fretta_votegraceperiod"		"30"
	"ttt_limit_spectator_chat"		"1"
	"ttt_limit_spectator_voice"		"1"
	"ttt_bots_are_spectators"		"0"
	"ttt_announce_deaths"		"1"
	"ttt_sherlock_mode"		"1"
	"ttt_minimum_players"		"2"
	"ttt_crowbar_unlocks"		"1"
	"ttt_fire_fallback"		"0"
}

I change the defaultgamemode for testing though and it won't work.
Also I've tested it with other players/bots for the same result

Hello there everybody,

I'm sorry that this is my first post and that I'm demanding stuff already but I'm having this issue with my TTT server.

The round instantly ends after the traitors are chosen, no matter which convars I change!

Can someone help me out?