i grew out the Z6 and Z7 standard and had the same problem...I spoke to Shanti and he said that some of the pheno's would throw out bananas around week 4 so I should watch them closely...this was when they first began working on the CBD meds and I figured it was a small price to pay in order to find the high cbd pheno's...now that the CBD Crew has worked out the magic formula I have heard of few complaints with any of the lines now being sold...great thing about any of the Z series is you could find a ratio very high due to the fact that they aren't all 1:1 so you could find plants like Charlettes Web with huge ratios like 25:1
I grew Z8/AfgHz outdoors so I can’t really help you with indoor developments. I will say the plant you pictured shows the same structure mine did, although mine got quite a bit bigger. So far I have not found any seeds in the Z8’s I grew. It might be a light thing or lack of light on the lower parts and removing those branches may be good advice or tek. Did you take clones?
Lollipopping and less plants in the tent .
Not enough light penetrating the canopy is the problem I diagnose .
Several of Shanti`s strains get upset if the don`t get well lit on the lower branches .
Critical Haze , Critical Mass / CBD Crit Mass and Ortega .
All have annecdotal evidence that lollipopping and more light down low remedies the intersexing .
Also you may well find cuts from these plants behave well . In future grows .
Shanti also recommends a long vegg before flower .