5CP and CTF are intentionally designed to work this way, starting a Sudden Death round if the team scores are tied (and the server is configured to do Sudden Death).
A/D CP
shouldn't be doing this, though... A/D CP is supposed to use the same rules as Payload, where the map doesn't change until the current round
+ ends.
Does this happen on every A/D CP map, or just a specific one?
+For Payload and A/D CP, multi-stage maps consider a single round to be until BLU wins all stages or RED wins any stage. For PLR and TC, it considers a round to be completion of any stage regardless of whether the scores were adjusted.
Edit:
Forgot to mention that you can use a plugin such as berni's
Map configs with prefix support to use slightly different configs for different map types. Maybe make certain map types have a round limit rather than a time limit. If you do this, don't forgot to set
mp_timelimit and
mp_maxrounds in every configuration, even if you're setting one of them to 0.