>> Dashboard and Memory_limit

Good morning,
I configure php to have 3000M of memory_limit
I take a look on my php infos to control and I got 3000M memory_limit : comme1marque dot com slash phpinfo dot php (witout s)
I go to wpmudev dashboard > support > system info : memory limit = -1, surprising !
Why is there -1 and How can I do to get my 3000M of memory limit as I configure in php ?
I already test define memory limit in wp config and htaccess, no diferences ...
Support AccessGranted
Thank you