Short answer
Both are real; they measure from different starting points. Western astrology uses the tropical zodiac, tied to the seasons and the spring equinox. Vedic astrology uses the sidereal zodiac, tied to the fixed stars. The gap between them, called the ayanamsa, is about 24°14′ in November 2026, so your Vedic sign is usually one sign earlier than your Western one.
How ChiChakra reads this
ChiChakra uses the Lahiri ayanamsa, the standard in Indian almanacs. It also leads with your Moon sign rather than your Sun sign, so the sign you see here can differ for two reasons: a different zodiac and a different planet. Compare like with like before deciding anything is wrong.
Which one to use
Use your Western Sun sign when reading Western horoscopes, and your Vedic Moon sign for the Panchangam, Sade Sati and Moon-sign forecasts. Mixing the two gives muddled answers.
If you were born in the last few days of a Western sign, your Vedic Sun sign may be the same, because the 24° gap does not cover the whole 30° of a sign.
Neither zodiac is a mistake. One describes the seasons; the other describes the stars behind the planets. Many people find both useful for different questions.
Good to know
Vedic apps can also disagree slightly with each other when they use a different ayanamsa.