We found that if we have 1 Bundle that consists of 3 Products.

*Bundle Package A
- Item A.1 qty: 1
- Item A.2 qty: 2
- Item A.3 qty: 5

Then if we put Bundle Package A as offering to customer through Opportunity, Quote, or any entity with Product Lines, it will automatically display and insert the required bundle individual products as well. But, the problem is, at the very first, the quantity is 1 at the creation time, and the Quantity of each individual product is also correct at that time (1, 2, and 5)
then users want to sell 3 Bundle at a time.. This quantity doesn't reflect the each individual products that should have Quantity as many as 3 Bundle should have, that should be multiplied by 3 (3, 6, and 15) accordingly, so currently they are not synced.

Reported Issue in Community:
https://community.dynamics.com/crm/f/117/t/149509.aspx

https://community.dynamics.com/crm/f/117/t/152351.aspx

I have tried to develop custom code as workaround, but it prevents me to update the individual required bundle products (attached)
I hope this issue can be solved soon since many users were expecting this Bundle feature in CRM 2015 so long and expecting no issue like this as well.