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I think you jumble up between Ecliptical coordinates (longitude and latitude) and Equatorial coordinates (declination and right ascension).
We have two circles that intersect at the Equinox points. Declination is an arc measured from a point on the circle of the Equator to the circle of the Ecliptic (when we look for a point on the Ecliptic ? the case is different with planets other than the sun, because they have latitude).
So, the ascendant and midheaven, being points on the Ecliptic, as soon as they are not at 0? Aries or 0? Libra, where the two circles intersect, they have a declination value different than 0 degree.

Points on the Ecliptic, when hitting 0? Aries (0? longitude, 0? RA) have a declination of 0 degrees. These degrees increase to +/- 23?26' at 0? Cancer (90? longitude and RA), where the value for the obliquity of the Earth shows itself, then the degrees decrease to 0 at 0?Libra (180? longitude and RA) to reach +/- -23?26' at 0? Capricorn (270? longitude and RA) and finally equalize again at 0? Aries (360? = 0?).