IT Algorithm. ¿how is this possible?

[banderas20]

Hello everyone.

I have deployed IT Services. The algorithm for the parent service is:

"Problem, if at least one child has a problem"
Calculate SLA is checked, and Acceptable SLA is set up at 85%.

¿How is it possible the following behaviour? That is, to have the parent service at a so low level when just one child has had a problem. (see attached image)

Thanks in advance.

[zabbix_zen]

The algorithm should be reviewed, the returned % is indeed far from than intuitive.