Factorio Forums

http://imgur.com/a/XJVv3

The 4 on the left stay on with the top left one doing most but not all the work and right side has just one in the bottom right on doing all the work.
Probably not a huge deal but worth checking out I think.

That could easily happen if steam engines these boilers are connected to do not consume all the steam these boilers can theoretically produce.

MrGuffels wrote:http://imgur.com/a/XJVv3

The 4 on the left stay on with the top left one doing most but not all the work and right side has just one in the bottom right on doing all the work.
Probably not a huge deal but worth checking out I think.

Thanks for the report,

This is most likely a quirk of the fluid physics,
And as such, not easy to fix, so i will move to known issues