Events+. Calendar arrow jump 2 months ahead

On my site https://www.****** when I click on arrow forward it jumps 2 months ahead. When I use the back arrow it’s working correctly.

I made a plugin/theme conflict and the issue still exist.

This is the shortcode I use:

[eab_calendar navigation="yes" footer="yes" show_excerpt="yes" with_thumbnail="yes" show_old="yes"]