Strange rejection from Shutterstock for Trademark

I had three of my images rejected by Shutterstock today for:

Trademark–Image / Metadata potentially infringes on intellectual property rights.

Here is one of them:

Rejected image

You can see the keywords in the link behind the image as well. I can’t see any trademark issues here – I even removed the small “windows” key from the laptop and the phones are tablets are very generic. Perhaps I need to remove the power buttons next! If anyone can see an issue, please let me know!

Update: As there were three images I tried different things on each of them. On one I removed the power buttons from the phone. On each of them, I removed some tiny markings on the white tablet that were the “go back” and “menu” items. Perhaps the design of those was problematic. I then resubmitted. This time all of them were accepted – which now gives me a further question – would they have been accepted because someone else looked at them, or did my removal of those tiny icons make the difference. I guess we will never know!