These are known bugs that are due to data corruption caused by slimefun. Multiple server owners and developers who use Slimefun have been looking into this but being corrupted data it's almost impossible to find the cause of said bugs.
Some partial solutions have been custom coded and we use them to reduce the inconvenience (when cargo node reset for example, it's a plugin our previous owner VoidAngel coded to do that: in reality they simply turn to heads like the capacitors sometime do but if someone right clicks them the plugin tries to restore previous data and replaces the head with the correct item, though it places it with default settings so that's why it looks like it's reset).
Unfortunately until now no complete solution has been found but we're all working towards a final fix. Thank you for reporting this!