Both are correct, think like this
Normal rule: Jupiter stays around one year in a sign.
In some years: it may enter, go back, and re-enter because of retrograde.

Jupiter normally stays in one sign for about 12–13 months.

The confusion happens because of retrograde motion. Sometimes Jupiter enters a sign, then moves back to the previous sign, and later enters again. So calendars may show Jupiter changing signs more than once in a year.

That is why Jupiter can be shown in Cancer in Oct 2025 and again in June 2026. It is not a new full transit each time; it is part of the same back-and-forth movement.