Apexi AVCR self learning is causing boost to drop

Hi guys,
Bit stumped with this and can't find any info anywhere.
I've had my avcr boost controller forever and I'm pretty competent at setting it up.
My low boost setting is 1.2bar and is spot on but my high boost setting is having a paddy.
Go through the usual set-up procedure of estimating the duty % and then going for a run from low revs in 4th gear to initialise self learn.
I have found that a duty of 66% is bang on 1.6bar which is what I'm after, but after it has self learnt and self adjusted the duty I end up with 1.1bar and it has brought the duties down to 50-55% ish,
I've never had any issues in the past so any help to shed some light on this would be great.
Thanks, Ben.
 
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