Hi
This is where Easyjet differ from Ryanair, in that they allow you amalgamate luggage allowances so if you had 2 bags booked in & one weighed 25kg & one weighed 15kg, that would be acceptable.
The reason that the limit for your one bag is 32kg, is because new rules were introduced a few years ago & no bag over 32kg is accepted as it is a health & safety issue for the baggage handlers.
I haven't actually been in your situation but as long as you are not anything over the 32kg, you should be fine.
Noreen