Oh, the problem is not the base plate. Carry on.
In this picture it's definitely not on straight. Try that?
@Tijs started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Oh, the problem is not the base plate. Carry on.
In this picture it's definitely not on straight. Try that?