SLA Fields' values are not return correctly in JIRA rest

When we retrieve and issue using rest api values for the SLA fields are not correct.
Here is a snippet from the response:

"customfield_10202":"com.atlassian.servicedesk.internal.sla.model.SLAValue@f245367","customfield_10201":"com.atlassian.servicedesk.internal.sla.model.SLAValue@19df96f5",

It would be very useful if you just return the JSON value on the database.