I have a few vials of these the one with an orange stopper expires earlier but why a different color stopper then the others? Should i be worried here? Click image for larger version. 

Name:	vials.jpg 
Views:	360 
Size:	1.18 MB 
ID:	157434Click image for larger version. 

Name:	vials.jpg 
Views:	360 
Size:	1.18 MB 
ID:	157434