lazy four-way flashers

[Gone in 60]

When I leave work in the evening, I can see the reflection of both the front and back of my bike in my office, and the one behind me. When I get on the bike, it's a good opportunity to give all of my lights a quick test since I can see both front and back.

Lately, when I hit the four-way flasher, only the left lights come on for a few seconds, then the right side lights join in. Does that sound normal?