Maybe that could be related to that?
When disabling it, it can avoid Circumstances. It might be a bit intimidating to disable something that is called ''Secure Boot'' but it isn't a big Problem. It is so: This Module makes that only certified Software can start. And Microsoft certifies that. So, You would have to trust Microsoft here that they do a good Job. And when using Windows, it might be a nice Addition.
But for Linux, this isn't really important. And a lot of Stuff isn't certified, too. That can be an Issue if You should need a different/newer Kernel for Example. Or for Drivers that doesn't be certified. So, disabling that when using Linux makes it easier and don't lead to Circumstances.
There shouldn't be a Risk. Of Course a 100% Guarantee isn't possible.