I just do not understand what is going on here, i think this is a good exsample of why you do not want your employees posting job site pictures of your pumps.

am i just being silly or is this wrong?

Looks to me that they are in their own yard/shop. Maybe one pump is plugged and using the other to blow it back the opposite direction? Not sure why they'd do it that way, but can't think of another explanation. Doesn't appear to be on a jobsite to me anyway.

Looks like one pump is water washing another pumps pipeline. Nothing wrong with that.

we do it at times , they are pumping a boom out to me

yes this can work as an another way to clean out a plugged boom if done in time.

Maybe they didn't get a sponge ball all the way back to the hopper. 

OR... Since they're only going through the 2nd, the main & the deck. They could have a bad water wash and rocked the boom off and trying to pump water through it backwards???