Every spore supplier is a little bit different.
However, the longer a spore syringe sits it will cause the spores to clump together and form into dark clumps in the syringe.
If this happens just try to shake it the best you can but rest assured there are still millions of spores that you can’t see in the rest of the clear liquid so you can still inject them into the bags.
If you order from mushroom prints they make their syringe fresh per each order so they will arrive looking like clear liquid but if you let them sit for about a month they will start to form the dark clumps as well.