Hello daydream3214 No, this is not an error. The weapons in the market are locked because they are not ready at the moment, so their gun ranks are high. We will release a new update soon, and newer weapons will come.
You can also forward the errors you see in the game via itchio or through our discord channel.
Poly Squad - Discord : https://discord.gg/mwq3Fky
I wish you good games and good times!
-Rakarnov