If a spire's upgrade capacity includes their starting upgrades, why do Refractor and Monolant spires only have an upgrade capacity of 2?

A Spire's Upgrade Capacity only limits a player's ability to add Upgrades using a Build Option during the build phase or during the onslaught phase as a Limited Build Option. The Upgrade Capacity does not limit the total number of chips a Spire may have. For example, the Narora construct a Refractor Spire with Attack and Range. They do not have any other spires In Play. Although the Refractor has three Upgrades with a capacity of two, the excess Upgrades are not removed. The Narora cannot add any more Upgrades to this Spire until its Upgrade Capacity is greater than the number of Upgrades it has, through a combination of constructing more spires with the Connected Talent and or the Spire losing Upgrades during gameplay. If a second Spire with Connected was constructed and the Spire lost one upgrade from the opponent attacking it, then its Upgrade Capacity is three and it has two Upgrades from having a chip removed by the opponent. This Spire can now have one upgrade added to it.