Motif of Bravery and Resonance buff tooltips state 'Effectiveness will be reduced due to mentoring', but they are being reduced to almost nothing.

Example: Level 36 rogue mentored to 35 in Scarwood Reach. Motif of Bravery would normally increase AP by 40, but only increases by 2 when mentored down a single level. Resonance has no effect at all.