I have renewed my contract as you are able to do to get a reduced package price and noticed the phrase that other boost and discounts are "carried over."
I took this to mean that they were also renewed at the existing level as part of the renewal process, but they are separate and shown as such when you view you Bill in My Account.
I'm sure there are other customers who probably feel they have extended their boosts at the same time as it was part of the original package (Contract) they signed up to.
I appreciate that boosts etc. are on a month by month basis so you can cancel at any time, and you may have signed up to a boost at a discounted level for a certain period, but I think it would be an idea to actually specify the end date of boosts discounts when renewing your contract online (from a transparency of contract perspective) and also have the opportunity to extend the boosts at the same level (if appropriate / available) or take advantage of any special deals that may be better on the boosts you currently have.