Why doesn't my war castle have my upgraded capacity?

When I upgraded my clan castle before a war, it went from holding 15 troops to 20. My war clan castle still says 15 troops, though. My clan castle was done upgrading before war started! At my regular village, it holds 20, but war base says 15 troops. Why is this happening?
Best Answer
When buildings finish upgrading during Preparation Day, your war base will reflect those upgrades. This includes your clan castle, and you can confirm this by scouting your own war base from the war map and selecting your clan castle.
However, the war map itself is not updated, and this is where donations take place. Once the war map itself is generated, it does not change, even if individual war bases have buildings that are newly created or upgraded. As a result, the donation capacity does not change since donations are mechanically tied to the war map and not your war base.
So, your war base will reflect your upgraded clan castle, which contains more hit points than it did before. But the war map will not reflect the upgrade so you'll still only have 15 spaces for troop donations for the current war.
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Does upgrading clan castle increase storage?
Upgrading Your Clan CastleUpgrading the Clan Castle increases its housing spaces, adding 5 units on each new level. Starting on level 4 you can request spells on level 6 you can request Siege Machines. During the upgrade you can use the Clan Castle without any issues.Is it worth upgrading the clan castle?
You should always upgrade everything to the max with every Town hall level. The Clan Castle should be considered amongst your higher upgrade priorities. Increasing its capacity will significantly improve your defensive strength. However, it is not your number one upgrade.How many troops can a max clan castle hold?
Players can normally donate a maximum of 6 troops per request, though up to 9 can be donated in a higher level Clan with the "Donation Limit" perk.How do you upgrade your war base?
The war base can not be directly upgraded or rearranged, but will instead mimic the arrangement and highest completed upgrade levels of your village during the preparation day. Buildings and traps will never be \u201cunder construction\u201d in your war base.Why Doesn’t Yeat Say Nigga
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Answer 2
Actually I had the same experience. During the preparation day, my clan castle has done upgrading (hours before the battle day). I noticed that the capacity is still 15 instead of 20. It is mentioned in the wiki that the highest completed upgrade levels of your village during the preparation day. will be applied but the clan castle I think has an exception.
Source: Clash of Clans Wikia - War: The War Map (2nd question)
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Images: Karolina Grabowska, Karolina Grabowska, Geometric Photography, Cristina