If by chance the daily you are talking about is Demonstration Battle, this daily is glitched for our server (Reni). It spawns a mob on request, and sometimes the mob glitches and he npc wont spawn more (kind of like glitching the Dalanis raid events back in the day). A good rule to follow is that if you are a mage, dont thunderstorm the spawn point for this daily!
If you were talking about another daily, tell us which daily you mean.
You can absolutely still complete dailies 10 times a day (unless you are trying a once a day daily)