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We present results of our analysis of up to 15 years of photometric data fromeight AM CVn systems with orbital periods between 22.5 and 26.8 min. Our datahas been collected from the GOTO, ZTF, Pan-STARRS, ASAS-SN and Catalina all-skysurveys and amateur observations collated by the AAVSO. We find evidence thatthese interacting ultra-compact binaries show a similar diversity of long termoptical properties as the hydrogen accreting dwarf novae. We found that AM CVnsystems in the previously identified accretion disc instability region are nota homogenous group. Various members of the analysed sample exhibit behaviourreminiscent of Z Cam systems with long super outbursts and standstills, SU UMasystems with regular, shorter super outbursts, and nova-like systems whichappear only in a high state. The addition of TESS full frame images of one ofthese systems, KL Dra, reveals the first evidence for normal outburstsappearing as a precursor to super outbursts in an AM CVn system. Our resultswill inform theoretical modelling of the outbursts of hydrogen deficientsystems.

Evidence that short period AM CVn systems are diverse in outburst behaviour