Yes that is normal. Kodiak manufacturers them in away that takes advantage of the fabric length and size so as to eliminate waste. The good news is we've had the seam across the ceiling for several year with zero leaking issues. These seams are water tight, down facing lap felled, and will not leak.
Source: Kodiak Flex Bow Tents BlogProtect your canvas tent with Kiwi Fabric Protector [amazonjs asin="B0000DZUZ1" tmpl="Small"]
View YouTube Video "Kodiak Tent 9x8 Ridge Pole - Part 2"
Measuring the lengths of the different ridge pole pieces on the 9x8 Kodiak Canvas Tent.