Polling period displayed to 0 but not set in jive

Hello, making some checking with device attributes, I noticed for a specific device that while testing the polling period of each polled attribute, I got a 0 value through get_attribute_poll_period for some attributes. However, when I check in jive, I see that the polling is not set.

In [1]: dev=DeviceProxy("A/B/C")

In [2]: dev.is_attribute_polled('attribute')
Out[2]: True

In [3]: dev.get_attribute_poll_period('attribute')
Out[3]: 0

I checked other devices launched by the same binary, with the same polling configuration, and this device is the only one with this behaviour.

Do you know why? And how to avoid this?

Regards,