Maximenu and Cassiopeia

I successfully upgraded a Joomla 3 site to Joomla 4 and set up a child template with Cassiopeia as parent and with Maximenu CK in the menu position and the Main Menu selected as source.

I've found that when I click on a Maximenu CK menu item, the underlying Cassiopeia layout appears momentarily - flashes - before my styled layout appears. If I disable Maximenu CK and use the Joomla native menu, the problem goes away.

Any idea what might be causing this behaviour?

Hi
Please give me the url of the page where I can check the issue
CEd

OK - sending you by email

I see a flashing header in blue with the cassiopeia name
but this is not related tot he menu, I got exactly the same by pressing F5, by clicking he other menu
this is a problem from your template, it seems that you still have the cassiopeia elements in your page, example

I'm using a Cassiopeia child template - wouldn't that mean that Cassiopeia elements should appear?

Just to be clear, if I disable Maximenu CK (I've done that now) the flashing header stops appearing?

wouldn't that mean that Cassiopeia elements should appear?

no, you can do what you want
I know the child template feature, but not duplicate it end fully customize it, without any link to the parent

I have tested without maximenu ck, exactly as you said the flashing is gone.
honestly I have never issued a such problem with maximenu ck, I think that there is really something to do with the template too

please put maximenu on the page again, so that I can inspect once more