events_calendar showing wrong month

Hello,

currently I am having a problem with the events_calendar.

I am using the calendar as a plain shortcode as [events_calendar], no conflicts, no editting.

The calendar on its own works perfectly well, except when I click on the month of July (Červenec), the calendar returns the events of July but the label returns the headline of month June (Červen), even the hover part where you switch between months.

This problem applies onto the month of July, all other months are working just well. It is also the same problem no matter which July I click on, its the same for every year.

Recetly I have found a topic that very well describes this problem and it looks like it is only a problem for the Czech version of the plugin (the one I am also using) and though the topic points out the cause of it, I have no clue how to fix it. It is a problem within the code and I have no idea what and how to edit it to make it work again.

The old, nearly resolved topic:

https://wordpress.org/support/topic/wrong-data-month-value-in-events_calendar/

Could you please give me an advice of how to edit the plugin to make it work again?

The page I need help with: [log in to see the link]