Antipaladin magical knack trait is not applying the +2 bonus to spell level.
An antipaladin of level 5 should have a caster level of 5/2 = 2.5 rounded down to 2
magical knack should then add +2 with a maximum of the characters hit dice(level)
my sheet is showing antipaladin casting level of 2
copied Paladin magical knack items in advanced players guide and changed paladin -> antipaladin. Looks good locally.
Merged , so Resolved