Help! Console commands problem

[120 BPM]

Recently I've started to experiment with console commands by launching a particular mission via the console - map c1m1 for example, and then enabling sv_cheats. The game seems to remember some of the commands I use, even after restarting l4d2 and steam. So whenever I set up a new game, the AI director is a little "modified", zombies act differently - for example, they don't immediately attack when you approach, there are less of them in general and special infected don't spawn as often as they're supposed to. My question is - How do I set custom games back to their default settings and how do I prevent the game from saving the commands I use?

[scintillating luminescence]

Changes to console variables are not generally persistent unless you add it to autoexec.cfg. Are you sure you aren't confusing auto-suggestion of console variables and commands with cached commands?