Hey Niv, odd one here.
When on the bid screen while your team is in an illegal state, if you submit a bid, the site stops you, but the cut link in the red status message changes from the “cutplayers” end point to just “cut”. This results in the missing/404/oops page. Just looking around, it looks like you used the cut endpoint for basketball, so maybe this checker is meant to be universal, but baseball still uses the older naming convention? On mobile, or I’d add some screenshots, sorry.