Hey Luigi,
I’ve tried making a project “sticky” and changing its tile size, as well as displaying it in a tag archive page on your website (did it with the “Diritti del malato” project item), and could not replicate the loss of background colour. Could you please create a sample of the project to demonstrate the bug, and let me know which one is it – I will troubleshoot further!
Sincerely,
Andrii / Satori Studio