My most users ever online resets every day.
How do i stop this from resetting everyday? Which option is it?:classic:

Never heard of this, I'll take a look in my admincp to see if I can find it. Maybe it's a hack you added? That's making your board working bad?

Look at this sites forum home page its in the whats going on section at the bottom..I think maybe yes it is a hack i cant remember.

if it resets everyday I would have a look at the cronjobs that are daily ran, perhaps indeed one that was added with another hack

turn off all your hacks and see if that changes it back to normal.

never heard of this happening but like its been said shut off all ur hacks hoppefully you use plugins and you can just disable them there and see what happens its most likely going to be a hack like users online today or anything that modifys the whats going on box on the forum home

ok will do..

or if anything is tampering wiht the maxloggedin row in the datastore because changeing the wrong field in that will reaset the whole thing as well as you may have deleted something in online.php in your forum root so check that out as well

if it carries on just add a cron job to replace it with the value you were last aware of or use my mod ;)...

sound indeed like you have some cronjob script that is running mysql update query, and prolly is given with blank/null values, so it stores it as zero.
try maybe to run your scheduled tasks one by one to see which one is causing this one.