Stats Greatly fluctuating. Do not know what is causing it.

So I am currently working on a group project in Unity 5. We are struggling with framerate issues at the moment. When taking a look at the stats they greatly fluctuate very rapidly. Examples of this is setpass calls changing between 80 and 6000, tris changing between 70 000 and 1,7 million and batches changing between 160 and 7500. Below are two screen caps taken only a second apart (note the changes in the stats window): http://i.imgur.com/rA6wXy2.png and http://i.imgur.com/wQxeeuZ.png Can someone give some insight into what might be causing this behaviour ?