QA Notice: Package has poor programming practices which may compile
               fine but exhibit random runtime failures.
    ...: warning: comparisons like X<=Y<=Z do not have their mathematical meaning
   

This warning crops up either when the programmer expected the expression to work or they just forgot to use sufficient parentheses. For example, the following code snippets are wrong (we won't get into the technical argument of this being valid C code; just change the code to not be ambiguous).

    if (x <= y <= z)
      ...;
    if (a < b <= c)
      ...;
   

To fix this, read the code to figure out what exactly the programmer meant.