I can’t reproduce that on my end at all
On the other hand I know what’s causing it on your end. Interactions you’re using are “coming” with
.js file that, while the styling comes with a
.css file. When the website loads it “reads” the
.html file from the top to the bottom and load necessary stuff “as it goes”. Your styling for the footer is that it’s expanded, entirely visible. Same as what you have in the Designer.
Then it loads the
.js file and processes through it making the Interaction “initial” setting to kick in and actually hiding the footer.
Keep in mind that processing power of the CSS and JS files, the speed it has to process it, is based on the machine. The slower the machine is, to longer it takes to process data. While everything happens under just a few miliseconds, it can be noticable sometimes
Recommendation for a fix:
Go to the Designer, and set the initial styling of the item as if it was already collapsed. That way CSS that kicks in first will render the footer properly. Make sure to update Interactions so they take that into account tho
Let us know if that helped