Safety stop when DECO?

Diving whit MK2i (v.8.40), when a dive becomes a DECO dive, once I've finished the DECO stop, safety stop is not required...

Last dive I tried just for check, at 21m I had 2 DECO mins at 3m. Ascending slowly, those 2 min disappeared before reaching 5m (safety stop deep), so when I reached 5m the watch didn't ask me to wait there for 3 min. If this is recommended in no-DECO dives,  should be much more when is a DECO one.

Any one knows about it? I asume that is a software error...