Strain Gages Measurment Error and Saturation
Figure 1. Strain gauge differences.

It seems to me that there are a few problems.


Gauge 1 seems to be bearing the brunt of the load with 2 and 3 following. All three seem to have reached some limit and deformed permanently.
The traces around 4 seem to be behaving normally with one (green) exception.
The traces at 5 are going the opposite direction which suggests that they are in tension rather than compression.


The first and last points make it appear that the setup is mechanically faulty, that the load is not balanced between the cells and some leverage is occurring causing some gauges to go into tension. This will put further stress on the sensors in the pivot area - probably 1, 2 and 3.