Why are my LED bulbs flashing?
Either because your dimmer is not rated for LEDs or your bulbs have a defect.

You have to understand that each LED now has in essence its own motherboard that controls how the LED bulbs are functioning, the dimmable ones being much more complex.  A lot manufacturers are still on their first generation of dimmables too.  They just aren't "programmed" to be used for all instances.  Whether it be the output the dimmer is giving, the way it gives it, other interference on the circuit, and so on.  Very good friend of mine manages at Lowe's and said that by far the #1 return in their store is dimmable LEDs.

So what can you do?


Make sure that your dimmer is rated for LEDs.
adjust the dimming settings on your dimmer
Try a different brand of LEDs.
Try a different style
Try a different wattage


I have track lighting above my stairs leading to basement.  Took me 4 different LED bulbs to find one that would appropriate dim without issues.  One never really dimmed (maybe got to 60-70%), one blinked like yours, and the other one only came on when the dimmer was turned at least halfway up - and when you got to 90% on the dimmer they turned off.  

I would say that in almost all of these cases there is nothing wrong with your setup it is just that the technology isn't ready for the new energy consumption regulations.  Dimming bulbs became very en vogue 15-20 years ago to save energy.  Some states required dimmers for incandescent outlets...  When LEDs first came out the manufacturers weren't worried about dimmers/energy savings since their bulbs would beat out the most dimmed incandescent.