Steps to reproduce:
1) Create trap item.
2) Create Graph widget with trap item. Additional parameters -
Aggregation function - count.
3) Start sending values to trap item and check Y-axis - left/right.

Result:
total - 2 values.
Left axis.

Right axis.

total - 3 values.
Left axis.

Right axis.

total - 4 values.
Left axis.

Right axis.

Expected:
Same number display format for every values amount.