Hey! Problem solved by now. I just erased all the dummie posts from Ikebana and kept my own ones.
As I told you before, after converting back from standard to project post, the standard ones got erased, and the “Home” portfolio page (where the issue was occurring) was trying to load some posts that simply does not exist anymore ! Probably that point was slowing down the page loading, and the script just fired the messages after waiting too long. Pretty simple, innit?
My basic plan with duplicated posts (standard and projects) was to keep a masonry homepage with them, and a classic blogroll “view” as an alternative with exactly the same posts. I´ll try to find any plugin useful for this.
Anyway, thank you for your time, and happy new year dude!