I'm new to homunculus, I noticed a status drop after the leveling status growth.
In the pictures, pay attention to the matk, at lvl 83 the matk was 308, after a while (vaporize), the matk dropped back to 303.
At lvl 84, matk dropped from 312 to 305 after the lvling growth.
From my awareness this happened for at least 4 levels in a row with or without using vaporize. I do vaporize just to refresh the status numbers.