I may have mentioned this before, but I wasn't 100% sure this was an issue but after fiddling with it for a while I see it is. Our server has a lot of modded dinos. We use your perch mod extensively and to many of my tribemate's chagrin having large nests on medium s+ pillars has only made my Wyvern collecting addiction worse XD! I have noticed that most modded flyers use nests and perches without issue. Even our Tabula Rasa alpha wyverns, which are massive and look rediculous as they set rather pleased on thier nests have no issue. But modded pteranodons ignore the nests and perches completely.

Its really only them. Wyverns, quetz, moths and others have no issue, But modded pteranodons are like 'Nope'. Im not sure what makes them different but our bionic and legendary pteras shun your lovely nests in lieu of sitting on the ground. I have no idea if you can even fix this, but if you can check into it that would be cool. Maybe it can't be fixed, maybe modded Pteras are just snobs? XD