join on startup causes false new message notifications

The supervisors in my office are included in ~10 chat conferences. When "join on startup" is enabled for each conference, the following happens upon logging in:

--new message pop-ups occur for each of the ~10 conferences. Occurs even when there are *no* new messages. They always display the last message for each conference, regardless of how hold the messages are

--each conference tab is lit, indicating a new message. Occurs even when there are *no* new messages

This is cumbersome for the supervisors, as they need to carefully click through each tab to ensure they aren't missing actual new messages. Any assistance would be greatly appreciated.

Spark details:

Spark 2.7.0

Build: 671

Ignite Realtime

Apache
    License, Version 2.0

www.igniterealtime.org

Smack Version: 3.3.1

JRE Version: 1.7.0_76

Thanks.

Zach