No the inside is well baffled matt black however I believe reflections of this sort are not uncommon when imaging using SCT and RC's from what I have read.
I noticed them on the 10 minute exposures I took of M83 (not as bad as this) but not on the 6 minute subs I did of Centaurus A.
I'm fairly new to RC/SCT scopes and imaging in general but being so perfectly round could it be reflection caused in the baffle tubes.
Also refer this link may give some ideas
http://astro.umsystem.edu/apml/ARCHI.../msg00238.html