Flash with OM-D EM-5 - its own flash unit vs FL-600R

Guys, please tell me what do you think it is the problem with my FL-600R versus the unit that comes with the EM-5. The smaller unit is much more powerful than the FL-600R. I'm using both in auto mode.

Here are the shots I have taken:

Unit that is included in the EM-5 kit:



FL600R:

Please, tell me what you think.

Best regards,

Nightrider.