MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
What hot-end do you have: OEM, E3D, MicroSwiss? Do you have a silicone sock on the hot-end or is it bare metal, or with paper&tape? For all 3D printed ducts, you really must use a silicone sock to keep the heat from affecting the cooling duct tips. If you do use a silicone sock, then how is your dual 5015 mount positioned vertically? The bottom of the cooling duct tips should be between 1mm and 2mm above the build plate (this will vary based upon the type and size of nozzle you have). I have mine set to between 1.2mm and 1.4mm.
Then check to see if the nozzle and hot-end are centered between the two duct tips. If the right side duct tip is closer to the hot-end than the left this also could cause what is happening.
The Hero Me Gen2 cooling system has been downloaded and used ten's of thousands of times with very few issues. I am always working to improve them when I get useful feedback. Your feedback is important to help improve the system.
For me to know more and provide better help (or to make corrections in the STL as Creality has changed the setup over time) I would need you to post a couple of close up pictures of your setup and the ducts in relation to the hot-end.