They seem detached
Cancer moon: This is a very natural position for the moon to be in. However they can be very private with their emotions, only keeping their true emotions within their close circle.
Scorpio moon: Due to the secretive nature of Pluto, Scorpio’s ruling planet. That makes Scorpio moons very private with what they’re feeling. Only ever revealing their true emotions when they trust someone immensely or is under stress.
They are detached
Gemini moon: Ruled by Mercury, this air moon tend to think and dissect their emotions instead of feeling them. They can repress feelings and can lead to a flood of emotions coming out eventually, triggered by the most minute things.
Virgo moon: Another Mercury ruled moon sign. They can pick at their emotions, dissecting it apart instead of outright feeling it. They can be in this state of mind/heart for a long time before just feeling all their emotions and getting it out of their system.
Libra moon: Libra is the scale, this moon sign wants balance. Inner balance is very important to them, it’s possible they might ignore a negative emotion just to keep that peace in their mind or explain it away only for it to come back later.
Capricorn moon: Ruled by Saturn. Saturn restricts the things that it touches so it can make them more analytical of their emotions, they could prefer to not feel their emotions if they don’t have to. It can also lead to a build up of emotions.
Aquarius moon: Ruled by Uranus and co-ruled by Saturn. Their feelings can come and go very sporadically. Being an air moon, they can also prefer to think about their emotions rather than feeling. This can lead to them having an overwhelm of emotions later on.
It can also depend on what house the moon is in.
Moon in the water houses (4th, 8th, 12th), emotions can be kept more private regardless of the sign. That can make them seem cold or detached when they’re really not.
Look at the aspects to moon also, it can alter the traits of whatever sign the moon is in.