Closing as Won't fix, because of the following reasons:

1. Stats on Graphs are displayed for different items, potentially having different units or unit prefixes (K, M, G, etc).
2. Zabbix displays four significant decimal digits (first four non-zero digits after the decimal separator), like 0.0000001234 (or 0.01801 on the provided screenshot), which will result in different length numbers.
3. Zabbix may switch to scientific number notation in cases of extremely large or small numbers, like 1.2345E-15 (0.0000000000000012345).

I think numbers in graphs needs formatting options to deal with this issues.