Month navigation jumps back to selected date

[alexpopovme]

If you open the calendar and press the "next month" arrow several times (e.g. until you reach March), the calendar shows the new month and then jumps back to the month of the selected date.

This happens only under certain layout conditions —
specifically when the datepicker menu is positioned close to the bottom edge of the window.

Steps to reproduce:

1. Open the datepicker (a date is preselected)
2. Click the "next month" arrow several times
3. When you reach March, the calendar resets back to the originally selected month

Reproduction link:
https://stackblitz.com/edit/vuepic-vue-datepicker-c8eynbsz?file=src%2Fcomponents%2FPlayground.vue

Expected:
The calendar should stay on the navigated month.

Actual:
The view resets to the selected date’s month.