Unexpected Positioning of 'resourceTimeGridDay' within '.ec-button-group' Div

[Artlyve]

Hello,

When I initialize my formats 'timeGridWeek', 'listWeek', and 'resourceTimeGridDay', sometimes 'resourceTimeGridDay' appears inside or outside the .ec-button-group div. This is a problem for me because 'resourceTimeGridDay' changes position unexpectedly. Do you have any idea what might be causing this?

[vkurko]

Please see headerToolbar description. Values separated by a comma will be displayed inside .ec-button-group. Values separated by a space will be displayed outside.