Date prompt language after prompt page refresh

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Hello everyone,

I have a report which can be run in two languages by the users (Greek and English).

On the prompt page there is an auto submit prompt which changes another prompt based on the selection.
There is also a date prompt (not connected to the other prompts in any way).

When running the report in Greek, the months in the date prompt are in Greek and when selecting a date without selecting anything else, the value in the variable is held with the month in Greek.
When a selection is made in the auto submit prompt though and the page refreshes, the month names are changed to English and then the selected date is held with English in the variable!

Anyone else had this issue? Is it a bug?