You need to make sure that the inner and outer liners match up correctly. Also, over-tightening the nuts can cause issues as well. Check out the Anvil Foundry group on Facebook. There is a video on the announcement section that shows you what to look for.
You are probably going to get a lot of responses that say the typical things, but I have been using Brewfather recently and like it. I like that it is seamless between my PC and mobile devices.