Dependent has different PD on I-485 Reciept

[emily_blue]

My husband's priority date 05/2017 (primary) is listed on his recently received I-485 receipt notice under classification of EB1 

But my I-485 receipt (dependent) has the different priority date as 09/2015 which is automatically linked to my I-140 applied in 2015 under classification of EB2 (not current). 

My understanding is all dependents application will be processed together along with primary. Do i need to really care about the priority dates on my receipt notices and contact USCIS? 

Pls. advise.