bug i think

Hello everytime i play ro2 sp allies the FIRST mission it always ending before time's up WHAT THE ****?!!!I defending the area killing enemies accross me but still is pop up that message that I not defended and I appears in the next defend location!!!I think it's a bug,i even not die when i defending.Idk but on axis campaign it was easier even with Heros Of Staliningrad difficulity,however I tried on all difficulities but still cannot complete the mission.Please help me.