Different color in construction (Subnautica)

built a multipurpose room, hitched her another one but when I started to hook onto the connecting shaft first room changed color from inside the blue border exactly in the middle of the corridors( the strength of the case base like normal). Demolished, was built in another place, put it all over, seems to be OK all the same color, build cabinets in the Central room, and they are blue in color, trying to broadcast in other areas of grey and again exactly at the middle of corridors. What does it matter? I can not find how to Staicele color changes, if it ever changes, maybe a bug what?
Game license, no mods