ScoreDoomST has received a patch to fix a major glitch with the chain bonus code.
Subsequently ScoreDoomST97c2R5g is not network compatible with earlier versions of ScoreDoomST.
Grab from the download page.
ProTip: Restarting Games (Resetting Scores)
To restart a scoredoom game and set the points to 0, (say when new players join), a player must call a MAP vote (via Multiplayer->Call Vote menu) to restart the map or load a new map, Or a player with admin access can (re-)start the map themselves.