You really need to download the Keel servicing manual which is among the Technical papers on the website. It will tell you everything about the keels and how they work. The keels don’t work in the way that a conventional centreboard works. I recommend that you read it before you attempt to solve this problem.
It isn’t a major problem but you will expend a lot of time and effort to free them.
It is inevitable that the keels will need attention when you have just got the boat. You may have to remove the keels to sort this out properly.
Trevor